I agree with the other two comments about anatomy/proportion issues here, but I also want to compliment you on both your color choices and your shading. Despite the anatomy issues, I get a sense of depth from looking at the image, and bad shading/coloring would have made that impossible. I'd bet you worked hard on this, and I hope you work just as hard on your art in the future. 
An alternative for Justine's solution is to move the eye a little lower, although it might change the dircetion she is looking its better IMO. The cheek is too pronounced, but I do see some artist who can execute it well. Upper part of the hair is good, do the same on the lower part, I think you will not fail.
Copying justine's:
http://i.imgur.com/SKMD50z.gif
Major problem with proportion here, but it's not the hair. The face is stretched like silly putty. You need to push it back into shape. Here's a quickly-done suggested edit and comparison. It doesn't fix the issue for you--it just highlights the issue.
thank for criticism everyone :D