Sole stitching and glue line
Reject if you can see glue bleeding past the midsole
Ask for a straight-on side shot of the sole at 45° and a close-up of the toe box seam. On a good pair the stitch count per inch is even and the glue line sits inside the welt, not on it. Glue squeeze-out is the cheapest thing for a factory to fix and the most obvious tell when it is not fixed.
Ask the agent “Can I get a clear side photo of the sole and one toe close-up in natural light?”