The usual miss: the countdown
"1… 2… 3…" is the enemy. By "3," the face has braced, the smile has set, and everyone looks like they're being photographed — because they are. The camera catches the pose, not the person.
Foundation 5Locked
The photos she actually keeps almost never come from 'look here and smile.' They come from a real moment you happened to be ready for. Here's how to manufacture real — on purpose.

The annotated breakdown is inside.
"1… 2… 3…" is the enemy. By "3," the face has braced, the smile has set, and everyone looks like they're being photographed — because they are. The camera catches the pose, not the person.