Keep the request smaller than the frame

The best prompt names one change and what the editor must protect. If you ask for a new mood, a different room and a cleaner table together, you will not know which instruction altered the people or product.

Reject a fix that creates a bigger error

An edit can look clean near the changed pixels and still break a face, label or reflection elsewhere. Compare full-frame before and after at the final display size. Preserve the source file even when the output passes.