Face outline labels and uncertainty

[MiaCow]

I am writing a small test plan for a portrait upload form that includes face shape labels. A tighter image border should be recorded separately from a different camera angle or facial pose. For the initial check, I would use one permitted portrait and keep its original dimensions documented. I would vary the border area while keeping the actual facial geometry unchanged in every copy. I am considering face shape detector as a reference while drafting the questions. The plan is still on paper, with no measured outcomes or confirmed behavior behind it. For each copy, I could note its border dimensions, category and any confidence information provided. Which observations would help distinguish a crop sensitivity issue from an unclear face boundary? I need a modest acceptance rule that allows ambiguous outlines instead of demanding identical answers everywhere.