After watching the second episode, I realised that one of the things that looks weird in Rin's face is the position of her mouth.
Please, look this original image:
View attachment 2912
I touched it up a bit, only the mouth:
View attachment 2913
It makes a big difference, IMO. I don't know why they made the conscious decision to change Tohsaka's face this way (a change for worse, IMO, again), since the other feminine characters preserve their faces without a noticeable change.
Once you notice the thing about the mouth, it's easier to spot in almost every shot. In profile shots, the area of the nose and the mouth can look really weird sometimes, as well.
As I said, the quality for this anime is very, very high, specially the backgrounds and the animation during battles, but I prefer some things about Zero.
Is that "spot the difference" picture puzzle?