The left side is lacking something. Although there isn't much space, it is causing the piece to be unbalanced. My recommendation would be the lengthen up the left side and then add something in the backround (he looks like he's in an icy place, so maybe some backround like a spire of ice that is blurred a bit and set close to the backround color, sort of like the mountain behind his head). Other than that though, It's looking great. I'm really liking the detailing you are putting in there. Just fix some of the compositional issues and you are set.
I do know this - xenforo dropped the ball by not keeping the vbulletin reputation comments as a feature. The loss of the Reputation comments data when we switched to Xenforo really was the death knell for the site when it came to all the users that left. I know I missed it so much and I got way less interested in the site when that feature was gone and I run the site.
I'm on a page about incorrect corrections, and spent the better part of like two hours trying to get someone to understand that -5^2 = -25, not 25, and then that post had comments get reposted because that group is self sustaining, and that person was in turn trying to explain what I just explained to them. And I'm taking that as a victory