Cool concept, and I really like your main model, who looks fierce. It would be nice if the background were a little less out-of-focus, the "demon" idea is mostly (only?) conveyed by the title.
I wouldn't be surprised if this scored well. It has plenty of elements which fit it to the challenge and the concept is very good.
Unfortunately, I just don't like it I'm afraid. It might be that the pout is a little off putting and the lighting is not dynamic enough and spoils the mood. Just a little over produced.