He's British. His teeth are just like that

You've never seen a human before, did you. Being an ugly MF doesn't disqualify you from being real.

AI tells in the image are rare, I found very few, but the one smoking gun is the arm of the headset continuing past the mic. Looks more like a breathing tube and that is the exact kind of logic mistake AIs like to make ("hospital headset", eh?), but humans would never do.

Watch this and stop using "I can tell by how the pixels are". In fact if you're not an artist just stop trying to spot it altogether you don't have the basic observation skills necessary.