First off, I think it's awesome. Just a little input. You might increase the values in the figure, the cloak and the shadowed areas of the figure. In response to that, you might also want to increase the contrast coming from the open maw of that hideous (but awesome) centipede creature to create more.... horror? Suspense? Also, I really like the smokeyness and the blue tones that are swirling around the figure, anything that you can do to play this up would also be helpful. I can tell that you have gone for a compressed value range, which is working out very well for you, I just think a little slight increase near the figures head and face is all it really needs. Very nice insectish textures and surface reflections. Overall a very nice composition and rendering.
Very interesting piece, grabbed my attention immediately as a thumbnail because of the colors.. I just wonder if you intended to make the creature's teeth transparent because that is how it appears with the touches of yellow on them, if so, that is quite cool and confusing at the same time.. overall, very well done!