Because those are the only areas that were redrawn. The original scan is here.
it looks a lot like kotobuki tsumugi from k-on!
She doesn't have those amazing Mugi-chan eyebrows though.zell9501 said:
it looks a lot like kotobuki tsumugi from k-on!
It's just a matter of time until someone posts an image of her masturbating with a bottle of cola...