I have a really hard time finding and any flaws on this drawing and believe me I'm good at it. xD... I love it, it is an excellent piece. The hair look amazing, the anatomy of the is flawless and the shading also great. Technique aside, it also seems aesthetically beautiful in grim and melancholic manner. Keep it up!
p.s. Nope... still can't find something wrong with it... xD