Makes me think of Cthulhu (did I spell that correctly?) Granted I haven't read much (any) of the Cthulhu mythos, so no one dissect that comment too much. Anyway, perhaps you could add some contrast to his innards by adding some more darkness in there, especially along the "back wall" of his insides. I'm curious what it would look like if you almost blacked it out and just caught the detail with highlights (not curious enough to do an edit, though.) Its a dark, mysterious, grotesque piece; I love it!
...Hey, I just now noticed his little mouth. It looks like a really fat kid's smile.