TikTok Shop requires children's swimwear and undergarments to be photographed flat-laid, never on a child model. Model shots are auto-rejected.
TikTok Shop / TikTok Catalog Manager requires product images that are publicly reachable, sized within the platform's bounds, in supported formats (JPEG/PNG typically), and free of overlays, watermarks, retailer logos, or text callouts. This issue trips when one of those constraints is broken.