Take a before, then line up the after with the ghost overlay.
Checks eyes and forehead only, so lips, jaw, chin and nose changes don't lower the score.
The capture button unlocks once the after reaches this match.
Takes the after by itself once the match holds for a moment, so you can keep both hands steady.
Test version. Photos stay on this screen only and disappear when you close it. Nothing is uploaded.
Unedited, exactly as taken.
Both photos unedited.
In the real app, these would now save to the client's Google Drive folder.