You have a good start going! I'm no anatomy expert, but a few things stuck out to me when looking at this:
-This could be me misinterpreting the perspective, but the minotaur's torso seems rather short; same thing goes for his neck.
-He doesn't appear to have elbows, which both confuses the eye and makes his arms look stiff.
-More a matter of a personal preference, but his feet look odd for a minotaur. Maybe make them a little more like hooves (or go with what Mathias suggested to add more emphasis to the minotaur aspect)?
-His head could use some work. It's pretty obvious that it's a minotaur, but you might want to take a closer look at the shape of
bull heads.
I also made a really rough edit to clarify a few things. I got way carried away with the shading and detailing, but I hope it helps for something!
Anyhow, I'm looking forward to seeing how this progresses! Good luck.