So far, It's a very cool picture, and an awesome looking concept.
I really like the extra details you added "inside" of the eyes, and the bark-y portions have a very nice "intensity' to it.
hmm... I bet the raven must love the fruit from this tree!
The fate of men, might weigh on me,
But I take that sin quite well,
Only cold wins, in the dark it seems,
But I hear there's warmth in hell...