I had a hard time differentiating her hair from the background and her lower torso seemed narrow

It looks really cool, and the detail is impressive. However, if I had one criticism, it's that she seems a good bit more evil than usual, most likely through the lighting and glow effects giving her face a lot of shadow. Of course, the "I think I'll murder you today" grin doesn't really help either. Nice job everywhere else, though. I'm particularly impressed with the anatomy.

I don't recognize the character, but she looks bad ass. The design is great and so is the lighting. (This is, undoubtedbly the best lighting I've seen since I created my account!)

the background was almost as dark as the hair, making it difficult to make out. But from what I see, it looks like it was designed by a pro.

How long have you been drawing? And how long did this one take?