I disagree with Ima, I really like the flat black in the hair, also the horn. Your style is sooo beautiful, I love it!
I'm crazy with that thing you did between the hair and her face, it's so soft and beautiful. The eyebrows too!
This looks really cool despite two things:
1: No pupils, but that gives her more of a gostly feel so this doesn't really matter much.
2: The Hair and horn just being one color a piece seems to not very well go with the style of everything else. It's like super cool detailed awesomeness turning to lineart in the same piece.
Despite that this is pretty good.
California dreamin' ! Two extra points ;) (damn, my level isn't high enough)