It's a great look and I love the costume, plus the model is ideal as well. However it is quite dark, and I know that this is due to the light source coming mostly from behind the model. The flash should have been used or the ISO should have been bumped up to compensate for the conflicting lighting issue. And last of all there are Photoshop actions and tricks (or techniques) that can help fix these issues, I know this because I drag and dropped the image into Photoshop and I was able to correct everything in 5 minutes time.
All in all I really do love this, I just wish that a greater effort would have been made to do the whole thing justice...especially doing "justice" for the model.