The hair is probably the most impressive part about this, but the face is also well done. Being a vampire calls for the skin complexion, and the eyes compliment that. I think her lower lip would look better if it was a little more plump. It looks sort of flat, and her ear is a bit too much on the small side.
Other than that, it is a good head shot. Apparently a new challenger has appeared. I'd better keep my eyes on you. XD