One of my personal faves. Love how realistic it looks but that's all down to careful
use of subtle texture and patience! It can be easy to focus too much on adding texture
which can end up standing out. Texture is something I work on as I go along rather
than adding, say, right at the end.
If you've not seen them already, my Big Red Speedpaint videos
show a 1-hour Hellboy
painting from beginning to end (slightly sped up) but you'll see how the texture builds
up from a very early stage. Let me know what you think.