Nice work on this, I personally think that a different angle of picture for this guy would make him look more like a demon, if you wanted to satisfy Waff over there. Take a pic looking down on him slightly and his eyes will look more sinister.
Unfortunately, this guy doesn't look demonish enough to me. He looks like santa clause who decided to change costumes for Halloween. In other words, not evil looking enough. Although I will say it would be hard to make it look evil, especially when it is a cube dude. The body itself is stupendous though.