The eyes are magnificent!! I can't pull away, they just grab you and demand attention. The reflection just adds that much more to the impact. I think it were just the open window then the reflection would have been be too much so I like it the way it is.
I like how the hair flows and follows the shape of the face. For me, when I first looked at the picture it almost adds a sense of motion, as if she's a spirit slowing swaying toward the viewer.
I agree with Metal, the lips are well done, they add to the image but don't take attention away from the eyes.