This is a very dynamic composition, not only due to your bold palette choices, but also represented physically by the posture of the subject. Your interesting use of transparency adds to the dynamic effect by giving the impression of motion blur. Overall, this is an interesting and well-executed piece.
But. (The critic's favourite word)
While the foreground is very strong, the background seems very unfinished, because it has a limited palette and considerably less detail than the subject. While the contrast between the two is understandable, the background needs to be brought forward more and kept in a consistent style with the foreground to make the composition feel whole.
The colors on this are mesmerizing, it makes me think that they should be mutable, shifting before my eyes or something like that. They give a real energy to this piece, and I keep following their dynamics with my eyes.
I just read Dean Kuntz's Frankenstien, and seeing this reminded me of the way one of his creations started killing people and opening them up to find the one piece that he was lacking-- happiness. Poignant.