2 things that detract in my humble opinion:
1) crop is too tight. I'd like to see more of the top of her head. Not necessarily all but some more and the sides are in tight as well.
2) there loos to me to be a green cast on the color image.
I know nothing but I love the crop too. It draws me right to the top third of the picture, her eyes, which to me seem to be the true subject of the picture. She is gorgeous.