Walmart Marketplace reviews images before a listing goes live, and its checklist is close to Amazon's: white main image, real resolution, nothing pasted on top.
The Walmart checklist is a subset of what a good listing set needs anyway. Renolvo generates it from one product photo: a compliant white-background hero, the specification infographic, scale and lifestyle frames — consistent, sized above the zoom threshold. One image from $0.54; 500 free tokens to try on your product.
The 500 free starter tokens are enough for several full sets. If you don't like the result, you have spent nothing of your own.
Try for free