Really awesome. I like how you drew, something black is spreading in her veins. And the skull on her wand is really great.
If I had something to criticize, it would be the hood. The dark petrol colored side could be sligthly lighter to contrast more from the darkblue background.
But don´t missunderstand me it´s allready a great picture. It´s often hard to see if critisism is required. If not just ignore me.