Can quality examine the identified plates behind those views against the actual cosmetic requirement? The physical region and its judgement need to be linked to the image before the label can serve as a defect reference.
What do the training notes currently tell the operator about those examples? I'd stop them becoming an unofficial standard while quality is still deciding what the actual surface contains.
That handles the teaching risk. For the capture comparison, can the holder and camera owners record seating and settings so they can change one condition deliberately rather than compare unexplained views?
Ella's point would help the lesson writer. A whole-part reject label isn't permission to circle whichever bright line looks most convincing in the slide.
Once those decisions exist, compare visibility of confirmed features and responses on accepted regions separately. Keep a later validation selection distinct from the examples used to adjust the method.