By skyforbes 
I’m using NanoBanana to improve lighting in my interior design render — specifically to add soft daylight coming from behind the camera. My prompt clearly states not to change any geometry, materials, or details, and only adjust the lighting.
However, NB still introduces random shifts in the final image, slightly altering details (example attached). This happens even when I explicitly tell it to keep everything identical and only improve the light.
Has anyone figured out how to prevent these unwanted changes? Is there a specific setting, prompt structure, or model mode that keeps the geometry 100% stable while only adjusting illumination?
Looking for any practical advice on how to get rid of these artifacts.