Make the face occupy 25–35% of the frame
Wide shots read as stock footage; extreme close-ups read as a video call. The band that performs is a head-and-shoulders framing where the face fills roughly a quarter to a third of a 9:16 frame. At that size the expression is legible on a 6-inch screen at arm's length, and there is still enough room around the subject for context — a kitchen, a bathroom mirror, a car seat — that tells the viewer what kind of video this is.