Sorry, but that face is in no way "realistic". To say that it is would be a clear indication that you are uninformed of the human face proportion.
The proportions are clearly off. This bothered me more than their decision to use rotoscope for the animation. The actress that played this character clearly looks nothing like this.
Look at the position of the nose. This gets worse when you try to scale up the set of black lines to fit the mouth and eyes in (for the original frame). Sorry, but "average" people simply don't look like that. Even the manga design is better proportioned.