It's just that "uncanny valley" kind of effect where the 3D model attempts to look "real" but just isn't enough. The stiff facial expressions doesn't help.
It's no big deal really. I'm trained as an artist so I'm picky about these sort of things.
Ohh haha I see what you mean Ratty524!! xDD and I understand, of course, trained artists are really good at picking up the details of artworks and that's really amazing! :D