They did the same thing for male characters (and enemies), as far as I can tell. It’s a caricature-like cartoon style, so emphasizing the traits that add character makes some sense. (Realistic-scale eyes would only be a few pixels, and it’s hard to show anything with that.)
edit: The above mostly applies to the world models in the game; the portraits are obviously large enough to allow less insane eyes. Then again, it’s a fair rendering of how the face of the game models would look scaled up, and that’s sort of neat.
