Inpainting Prompts: Repair One Part of an Image - Nano Banana 2

Before the prompt matters at all, the shape of the selection matters. A mask drawn tightly around the defect gives the model almost no room to work with, and the new content gets crushed into the outline you drew — this is why a tight mask around a bad hand so often returns another bad hand in exactly the same silhouette.

Include context. Mask the hand and some of the forearm and some of the surrounding background, so there is space to place the fingers somewhere new. Feather the edge if the tool allows it, because a hard boundary produces a visible seam even when the content inside it is perfect.

Removal is worth stating positively. Asking for something to be gone tends to work less well than describing what should be there instead: not “remove the sign”, but “plain brick wall continuing across”. The model is filling a hole, and it does that better when it has been told what the hole contains.

The most common complaint is a repair that is technically correct and still obviously a repair — slightly different light, slightly different grain, slightly cleaner than everything around it. Naming the lighting direction and the medium in the inpainting prompt usually closes most of the gap, since the model has no view of your original prompt and no reason to match its treatment otherwise.