Holy shit! Real life anime eyes! Okay, kidding aside, blend it up a bit and check your anatomy against the actual source. As it is, there are noticeable divergences where you've stopped actually painting the subject and went on a tangent.
I'm no wiz at portraiture myself, but definitely look at the relationship between the model/photo's nose and mouth. In your drawing you've distorted the noses' shape quite a bit and moved the mouth down on the face. There's also a noticeable difference in the shape of the model's right brow.