I feel like there's slightly too much black space at the top.
I don't like the way the person is posing. You can tell that someone said to them "go stand over there". I actually get more of a spooky "horror" kind of vibe from the picture so I think it would be really freaky if the model was looking directly at the camera. They'd have big dark shadows under their eyes and if you could get a tiny highlight of a light behind you or over to the side to reflect in each eye it'd REALLY give me nightmares, lol!
Overall though, I like the colours and what you've tried to do!