A great piece, I like your use of the lime green as it gives a brilliant contrast to the other, much more dark aspects of the image. The style itself reminds me of something that would be used by Tim Burton as a piece of concept art.
My criticisms of this piece are manly that the face of the girl/guy to the left has a more japanese feel to the drawing style that doesn't really sit well with the rest of it. Other then that it's amazing
keep it up.