Typical scenarios within this site’s subject: questions to ask, materials to prepare and points that can be examined.
Typical scenarios
A reflected video frame in portrait comparison
If a face appears through a reflective surface, ordinary labels for its right and left sides may mislead. Suppose that frame and a direct photograph are submitted, but the frame's provenance is incompletely described.
Photographic differences may result from the position of the head
If one photograph is frontal and another shows a turned face and tilted head, apparent proportional differences do not by themselves establish different people. First, the examination should identify which features are available and how imaging conditions affect their appearance.