This piece is really good! The muscle definition is pretty cool, but still within the cartoon(y) style. Although for this piece I would have picked a line colour that complemented the earthy tone of the piece rather than pure black, to make it just a little more soft, because I think the lines are very distracting in my opinion.

Absolutely beautiful Paint 3D base brush texture. But on a serious note, I would suggest Krita. I could help you set it up considering the default settings are ass

Your art is amazing... How long have you been painting?