Goron Sprite

I'm trying out a couple of things that I haven't really used in previous works like selective outlining with this one, but I'm still pretty new to that. I think it goes without saying, but included above is a sprite of Darunia from the Zelda series. I figure it still has ways to go, so any feedback is appreciated. One of the main problems I'm working on right now is the muscle definition near his back, since the linework and shading is pretty messy there.