Defined = detailed, I'm guessing.
Also, this needs a contrast boost.
Does it have boobs? It looks like it has boobs. I think it's a golemess. Looks like a golemess.
Tiny legs.
For a stony texture, you might want to make him look like he's made up of smaller boulder-stones. right now, it just looks likea grey man-chick with short legs and wrinkly clothes.
Increase the contrast. Lower the colors. You only need 4 colors for this...even just 3 would suffice.