Keep the model context, then adjust subject, style, lighting, camera angle, and output ratio before remixing.
Replace vague nouns with concrete subjects, locations, colors, materials, and mood words.
Run one strong version first, then iterate only the parts you want to change.
Prompt
You can take it one step further and ask Nano Banana Pro to create a sprite sheet based of your game cover. Prompt: create a sprite sheet for a 2D NES platforming game, include enemies and NPCs
