Very Nice. I love the overall feeling of the design. I do have a few small issues with the pose. I don't know a single archer who would shoot their bow "gangsta" style i.e. on the side like that. Second the fingering on the arrow hand is wrong, archers use two fingers one on top and bottom of nock to ensure proper aim. That said these issues could just be a character quirk.

Could you make a model sheet (like http://www.davidrevoy.com/data/images/blog/2011/11/littlebotbunny_davidr...) out of this? Then I could make a model out of it.

I think I could incorporate this concept art into my project (as 2D).  The attribution instructions are not clear to me, though.  :)

FYI I have used this graphics for splash screen in my free game for Atari Lynx.
Doing my best, I've attributed the character to kirill777.

Playable online here: https://atarigamer.com/lynx/game/SilasAdventureSV2k19Version/680356193

Nice!