[thom]

This is a bit like chess puzzles. When you know there’s some winning tactic, you’ll sit and look for it until you find it. But in most real positions in actual games you don’t know and sometimes have to trust your gut as to whether to spend time on the details. If you know one picture is fake you’ll find it. If it’s just a social media avatar, you’ll assume it’s a real person.

That said, even without looking deeply for weird smooshy patterns, inconsistent curves, lack of symmetry or nonsense clothing, the biggest giveaway is that most AIs are pretty bad a realistic lighting. I got most of these at a glance because it’s a very pronounced difference.