Hoi, Thought I'd chime in with some comments.
I like the way everyone gives praise and it is a brilliant sculpt and paint job, but...
The muscularity on his back is weird, maybe look up some anatomical drawings for how it should look, it actually looks like drooping fat, rather than toned muscle.
His head/neckline is also off, the neck bulges up too much, and just doesn't sit right.
I mean for these comments to be taken as respectful advice, not as a criticism, the overall effect is excellent, and these points are tweaks, at best.
Thanks!