This is a good picture, but I'm just afraid that this will be voted down because of the size, you should use the 640 pixels that we are allowed to use in challenges.
A little small (using the maximum 640 px length might make the details more prominent). The lighting on the face is very well done. A little more lighting on the hair (from the back maybe) would help separate her hair from the background. This blending might be intentional but I find myself straining to see the separation.