from the rendering you already have a sorta op upangle lighting. I think this is very effective for the character to show how menacing he is. I would go with that, and maybe a little back lighting to help creat a little ambience. The back lighting might also allow you to creat a little more shadow around the front of the feet which always helps in wighting down the character to ground him. Though he seems fairly well grounded already. Great update, how are you planning on colouring him??? (technique wise)
EDIT::
It would also be nice to see that tail and the end of the pitchfork in the shot, the tail especially is an awkward crop as there is so little being cut out it makes it feel like a mistake an creates and uncofortable feeling in the viewer (“somethings not right but I don’t know what”) That would help a little.
Also what do you intend for the background??