Every architect comes back from a trip with a camera roll full of buildings. Site visits, study trips, a detour on holiday because something was worth looking at. The photographs are useful and slightly unsatisfying, because a photograph is a record rather than an observation.

Drawing a building is how you actually look at it. Most of us stopped having the time.

Here is a way to get the drawing back. Four prompts, one photograph, four studies.

That was a photograph an hour before. Everything incidental has gone and the three lines below it turn what is left into a plate from a series, which is the variant covered at the end of this post.

The four treatments all work the same way. This is the same idea in pen, on a different building.

The dusk sky, the passers-by and the cobbles are gone; the cladding rhythm, the balcony overhangs and the courtyard are not.

None of this needs to come from a trip. A render of your own scheme works exactly the same way, so does a site photo, a competition entry, or a finished project you have only ever shown as photographs. The prompts say building; they do not care whether you designed it or walked past it.

That makes this as much a presentation technique as a sketchbook one. A scheme shown in three media reads differently from the same scheme shown in three photographs.

How this got better by taking things out

The starting point was a "Rubber Stamp Travel Field Notes Poster" prompt doing the rounds on Threads. It was busy: a split layout, travel text, dates, decorative stamps, an aged-paper effect. A lot of ideas competing on one page.

Stripping all of it out is what made it work. No text, no panels, no stamps, no aged paper. Just the building, centred, with generous whitespace around it.

That lesson generalises. When a prompt gives you a cluttered result, the fix is usually removing instructions rather than writing better ones. Every element you name is another thing competing with the subject.

You can see it in the prompts further down. A large share of each one is a list of things to leave out.

Four architectural illustration styles from one photograph

You have seen the pen study of this building already. Here are the other three, from the same photograph.

Pen. Fine black ink, varied and expressive line weights, restrained cross-hatching and stippling, with white space doing the work of light and shade. Selective detail against deliberately unfinished sections. The strongest of the four and the one that suits most buildings.

Doodle. A Procreate-style digital sketch. Loose pen lines, flat hand-filled colour with gaps around the edges, a few spontaneous marks left in. Three to five muted colours sampled from the photograph over a charcoal outline. Playful and intentionally imperfect.

Watercolour. Translucent layered washes, visible pigment blooms, feathered edges and dry-brush texture, with construction lines still showing. Areas left unfinished and paper left exposed. Good for anything with planting, weathering or a strong sky.

Rubber stamp. Hand-carved aesthetic: irregular linework, uneven ink density, incomplete transfer, lightly distressed edges. Two to four muted spot colours from the photograph. It sits smallest on the page, and the imperfection is what sells it.

Whichever you pick, the proportions, the roofline, the structural rhythm and the details that make the building recognisable survive.

It works on interiors too

Exteriors are the obvious case, but the same four prompts hold up on a room. The word "building" in each prompt can be swapped for "interior" or "room" without changing anything else.

Interiors carry more small objects than a facade does, so the pen study is where the editing shows. Look at the rug, the table setting and the boucle armchair. Each one is described with enough line to be read and no more.

One treatment, many buildings

Run a single treatment across everything at once: a trip, a portfolio, a competition submission, a practice's back catalogue.

Twelve buildings in twelve different photographs, taken in different light, at different times of day, on different cameras, is a folder. Twelve buildings in one visual language is a collection.

Those three plus the Glasgow plate at the top of this post make four different buildings in four different cities. Nothing about the source photographs matched: different countries, different light, different cameras, a tower next to a courtyard block. The output matches, which is what makes it a set.

That collection hangs on a wall, goes in a studio newsletter, or becomes the back half of a talk.

It does more work on your own projects. Put your last six schemes through one treatment and the portfolio stops looking like six separate photo shoots. Run a single project through all four and you have a spread: the pen study for the drawing set, the watercolour for the mood page, the stamp for the cover. A client reads that as a practice with a visual language, which is a different message from a folder of renders.

The prompts

Upload your photograph, then run these as written.

Every image in this post came out of GPT Image 2.5, either Flare or Sunburst. Both are very good at this: they hold the building's proportions while changing the medium completely, and they follow a long list of exclusions without drifting. Flare is the faster of the two, Sunburst takes more care over the output. Use Flare while you are trying treatments and Sunburst for the one you are keeping.

1. Black-and-white pen drawing

Create a clean composition featuring a single black-and-white architectural pen drawing of the building from the uploaded photograph, centred on a crisp white paper background.

Accurately preserve the building's identity, proportions, perspective, silhouette, roofline, openings, structural rhythm, material divisions, and most recognisable architectural features. Simplify insignificant details without redesigning or altering the architecture.

Render the building as a refined hand-drawn architectural illustration using: fine black ink lines; varied and expressive line weights; precise perspective construction; restrained cross-hatching and stippling; occasional loose sketch lines; subtle hand-drawn irregularities; selective areas of detail contrasted with unfinished sections; white negative space to describe light and form.

Keep the drawing monochrome, using only black ink and the white of the paper. Avoid grey washes, colour, photorealistic rendering, heavy shadows, or dense shading. Use darker line weight only to clarify depth, primary edges, openings, and important architectural features.

Position the architecture precisely in the centre of the page at a moderate scale, surrounded by generous, balanced whitespace. Include only a minimal ground line or a few restrained context marks if required to anchor the building.

Use a clean white paper background with a very subtle natural drawing-paper texture. The page should feel contemporary, precise, and gallery-like.

Do not include text, dimensions, annotations, labels, grids, borders, title blocks, logos, people, vehicles, vegetation, decorative marks, or unrelated surroundings. The final image should contain only the central architectural pen drawing and the clean white background.

2. Digital architectural doodle

Create a clean composition featuring a single digital architectural doodle of the building from the uploaded photograph, centred on a warm off-white background.

Preserve the building's identity, proportions, silhouette, perspective, roofline, openings, structural rhythm, and most recognisable architectural features. Simplify minor details while keeping the subject immediately identifiable.

Render it as a playful hand-drawn Procreate-style illustration using: loose, expressive digital pen lines; varied and slightly imperfect line weights; simplified architectural shapes; occasional overlapping construction lines; flat, hand-filled areas of colour; subtle gaps and imperfections around colour edges; a few spontaneous scribbles or gestural marks integrated into the building; restrained digital crayon, marker, or dry-brush texture.

Use a limited palette of 3–5 muted colours sampled from the original photograph, combined with a dark charcoal or black outline. Keep the colours slightly uneven and handmade rather than perfectly polished or vector-like.

Position the architecture precisely in the centre of the page at a moderate scale, surrounded by generous whitespace. A minimal ground line or loose shadow may be used to anchor the subject, but do not create a complete background scene.

The final result should feel like a confident architectural sketch made in Procreate: playful, contemporary, graphic, and intentionally imperfect.

Do not include text, labels, dates, logos, borders, stickers, arrows, decorative icons, people, vehicles, unrelated objects, or a detailed environment. Include only the central architectural doodle and the clean off-white background.

3. Watercolour study

Create a clean composition featuring a single watercolour study of the architecture from the uploaded photograph, centred on a warm off-white paper background.

Accurately preserve the building's identity, proportions, silhouette, roofline, openings, structural rhythm, perspective, and most recognisable architectural features. Simplify minor details while keeping the architecture immediately identifiable.

Render it as a loose but controlled architectural watercolour: translucent layered washes; visible pigment blooms and subtle colour bleeding; lightly feathered edges; occasional dry-brush texture; restrained pencil or fine ink construction lines; areas of unfinished detail and exposed paper; soft tonal variation rather than photorealistic shading.

Extract a limited, muted colour palette from the original photograph. Allow a few pigments to gently merge, but keep the principal architectural edges and proportions legible.

Position the architecture precisely in the centre of the page at a moderate scale, surrounded by generous, balanced whitespace. Keep any ground line or shadow extremely subtle so the building appears anchored without creating a complete landscape scene.

Use clean, warm off-white watercolour paper with a delicate natural grain. The page should feel refined and contemporary, not dirty, stained, aged, torn, or heavily distressed.

Do not include text, dates, labels, logos, borders, decorative marks, additional stamps, people, vehicles, unrelated objects, or an elaborate background. The final image should contain only the central architectural watercolour and the clean off-white paper.

4. Architectural rubber stamp

Create a clean composition featuring a single architectural rubber-stamp illustration centred on a plain, warm off-white paper background.

Analyse the uploaded photograph and accurately preserve the architecture's most distinctive features, including its silhouette, proportions, roofline, arches, openings, towers, structural rhythm, and other recognisable elements. Simplify secondary details while keeping the building immediately identifiable.

Render the architecture using an authentic hand-carved rubber-stamp aesthetic with irregular linework, subtle variations in ink density, incomplete ink transfer, lightly distressed edges, and slight natural imperfections. Use 2–4 restrained spot colours derived from the original photograph, prioritising muted architectural tones.

The stamp should be moderately sized and positioned precisely in the centre of the page, surrounded by generous, balanced whitespace.

Use clean, high-quality off-white paper with a subtle natural matte texture. The page should not look old, dirty, stained, damaged, or heavily distressed.

Do not include text, dates, numbers, labels, logos, travel symbols, borders, postage marks, decorative stamps, landscape fragments, plants, vehicles, people, or unrelated graphic elements. Include only the centred architectural stamp and the clean off-white background.

Adding a maker's mark

Every prompt above bans text. Once the composition is clean, you can put exactly one piece of it back, and it changes what the image is for.

Swap the final paragraph of the stamp prompt for this:

Below the illustration, include a small, understated maker's mark reading exactly:

DESIGNED BY FENESTRA OSAKA, JAPAN 2026

Do not include any additional text, dates, numbers, labels, logos, travel symbols, borders, postage marks, decorative stamps, landscape fragments, plants, vehicles, people, or unrelated graphic elements. Include only the centred architectural stamp, the specified maker's mark, and the clean off-white background.

Three lines, and the study becomes a plate from a series. That is what the four stamps above are carrying. Change the first line to your studio, the second to wherever you were, the third to the year, and a trip's worth of buildings arrives already captioned and dated.

The word "exactly" is doing real work in that prompt. Without it the model treats your text as a suggestion and paraphrases it.

Lettering is the one part of this that image models struggle with, so choose the model deliberately. Qwen Image 2 Pro is the sharpest on text of the ones we have, and the GPT Image 2.5 pair follow instructions tightly enough to hold the mark to three lines.

Try it on your own photographs

Open Fenestra

Your turn

Open a folder. Your last trip, your last project, whatever is nearest. Pick six buildings, run the pen prompt across all of them, and look at them together.