This is really great. The only thing I'm concerned about is the blending of the hooves to the ground. I know it's dark and gloomy, so it's more concealed than not, but it does look like his front legs sort of disappear on us.
Dang. I'm so jelous. My artwork isn't nearly as good as yours. I need to work on painting in manes and tails. Not that you care. xD But yeah, it's great!