If he is "exactly who he says he is", then why wouldn't the pictures posted by himself not be of him? If you don't know which ones are which, just look at his posting history to find the correct ones.
For the avoidance of doubt.
Having met Zhou, Tihan should be able to say/repost which photo is of him.
Without having to first contact Zhou on this forum or otherwise.
BB.
This is a non-issue now. Tihan didn't know the newly posted pictures and Zhou's pictures of himself were posted long ago. Only if you followed the story just recently would this be an issue. Now that Tihan says Zhou is who he says he is, namely a freshman student with an I-toy and a 1k physical gold bitcoin, I'm certain that's how it is. Look for other clues, Sherlocks.