Pluto did you add the monster in photoshop :p The shadow looks a bit fake xD Also I noticed something watching that screenshot, the silhouette of the hair looks a bit stiff. One more cut to smooth out the hair a bit would probably improve the look of the monster a lot.
Also there is no shadow coming from his hair. One would expect the area under the hair to be darker than the area that is not under the hair. Might want to darken the area under the hair and then of course give him a proper shadow. Just a few things I noticed
Ps: Looking at it again the shadow probably behaves like that in the Amnesia engine. One would think the shadow would be smaller the further away it's from the lightsource, anyway can't wait to play it.