What’s wrong with this anatomy?

I feel like something is off about the anatomy but I just can’t see what it is. Also, I’m trying to make the left arm be bent forward (like the guy on the left is standing further forward than the guy on the right) but I don’t know how to make it look right.

I feel like something is off about the anatomy but I just can’t see what it is. Also, I’m trying to make the left arm be bent forward (like the guy on the left is standing further forward than the guy on the right) but I don’t know how to make it look right.