Image rules that commonly fail Google Shopping: HTTPS, resolution, overlays, and reachable URLs.
Primary images must be HTTPS, reachable, show the product (not packaging-only when prohibited), and meet minimum resolution — typically 250×250 for apparel.
Avoid promotional overlays, watermarks, and broken links. FeedScrub probes up to 50 image URLs per scan and flags URL-pattern suspicions when HEAD checks are inconclusive.
Fix images at the source CDN, update <g:image_link>, and re-run an audit filtered to image-related error pages.