Interior Design Reinvented: Nano Banana Meets Fenestra

5 Prompts for quick edits, lighting moods, and archviz-ready renders — see why designers are combining AI models in Fenestra.

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Shaun McCallum

September 15, 2025

In Fenestra, you can combine multiple AI models to execute any idea — whether that’s an interior design project or a full architecture project. Today I’m sharing my top 5 prompt ideas for pushing your interiors to the next level using Nano Banana inside Fenestra.

👉 To access all Conversational Models in Fenestra, open Conversational Edit on the right-hand side and select from the dropdown.

1. Swap Furniture & Artwork

Nano Banana is brilliant for quick edits. Here’s a starting point:

“Replace the artwork above the fireplace with a modern Japanese-inspired historical painting, blending traditional brushwork and muted earthy tones with a contemporary minimalist framing. The sofa is replaced by a soft sculptural sofa — organic, flowing shapes with smooth fabric upholstery that looks plush and inviting, in a neutral colour palette that harmonizes with the wooden ceiling and stone floor.”

Simple and powerful - check out the comparison for yourself.

2. Add People for Atmosphere

Adding people is a great way to make your AI architecture visualizations more engaging. Sometimes short prompts work best, sometimes longer ones:

• Quick: “add a couple enjoying a glass of wine together on the sofa”
  
• Expanded: “Nestled together on this sculptural sofa is a couple, relaxed and close, enjoying a quiet evening. They share a glass of red wine, their body language calm and intimate, adding a sense of warmth and lived-in comfort to the architectural scene.”
  

Small edits = simple prompts. Big edits = more context. This is my general rule of thumb when working with Nano Banana in Fenestra.

3. Create a Macro Shot

For archviz and interior design, macro shots bring focus and detail even when you don’t have a full 3D model:

“take a macro photography shot of the coffee table showing their bottle of wine, cheese board and the couple, the interior and the painting in the background”

This is one of Nano Banana’s strongest use cases - context-aware details that make interiors feel alive.

4. Change the Lighting (Mood & Atmosphere)

Use Nano Banana for mood edits, or switch to Flux Kontext Pro when you need sharper, more convincing dimming.

“The room is set at night with overall dim lighting. The primary source of illumination comes from the fireplace, casting a warm, flickering glow across the interior surfaces and creating soft highlights on the sofa and chairs. Subtle up lighting in the garden filters through the glass, revealing silhouettes of trees and plants against the darkness outside. The built-in shelves are softly backlit, giving a gentle ambient glow without overpowering the scene. Shadows fall naturally into the corners, balancing warmth with depth, and the overall atmosphere is romantic and serene, defined by contrast between the glowing interior and the darkened garden beyond.”

This is where mixing models inside Fenestra AI makes a real difference.

5. Environmental Changes (Bonus Prompts)

Nano Banana shines for changing context — here are a few environmental variations perfect for interiors and adaptable for exterior renderings too:

Snowy Winter
(cold blue hues outside, warm glow inside)

“It is a cold winter evening, the room softly illuminated in contrast to the snowy night outside. The fireplace glows warmly, its flickering light casting golden highlights across the sculptural sofa and stone floor, creating a strong contrast against the cool blue hues of the environment beyond the glass walls. Outside, snow is gently falling, visible through the tall windows, with the garden bathed in subtle uplighting that reflects off the snow-covered trees and plants, giving them a frosted shimmer. The shelves provide only a faint, low backlight, leaving much of the room dim, while the interplay of warm interior tones and the icy blue glow outside creates a romantic, intimate tension. Shadows stretch softly across the space, and reflections on the glass capture both the warmth inside and the cold wintry scene beyond, heightening the cozy atmosphere of the evening.“

Autumn Evening
(firelight warmth + amber/crimson foliage outside)

“It is an autumn evening, the room softly illuminated by the warm glow of the fireplace. Flickering golden light spills across the sculptural sofa and wooden ceiling, contrasting with the deep, earthy tones of the season visible through the glass walls. Outside, the garden is dark, but the uplighting highlights trees with leaves in shades of amber, crimson, and burnt orange, their colors reflecting faintly against the glass. The shelves inside give off a gentle, low backlight, adding depth without overpowering the scene. Shadows gather naturally in the corners, emphasizing the cozy warmth of the interior. The atmosphere is romantic and serene, with the interplay of glowing firelight and the rich autumnal hues outside creating a tranquil evening mood.“

Morning Mist
(sunrise, dew, and soft shadows)

“It is early morning at sunrise, the room softly bathed in gentle golden light streaming through the floor-to-ceiling glass walls. Outside, the garden is veiled in a delicate mist, with a faint haze drifting among the trees and plants. Drops of morning dew glisten on leaves and grass, catching the low, slanting rays of sunlight and sparkling faintly. The interior is subtly illuminated by this natural light, creating a soft, diffused glow that highlights the textures of the sofa, wood ceiling, and stone floor. The shelves remain dim, with no artificial lighting, allowing the ambient morning light to define the space. Shadows are long and soft, stretching gently across the room, and the overall atmosphere feels calm, fresh, and serene - a tranquil moment of new beginnings as the world outside awakens in mist and light.“

Try it out yourself, adapt the prompts for your own use cases!