oh, i didn't realize you were searching for an artist to do sketches, i probably would've try to add more detail to my character (Kalvin).
hmm, i suppose you could have him wear the rock armor (if it'd be easier to draw) but maybe not too much like the example (the texture is fine). it'd be more a thin layer of rock covering his body, from head to toe, but then again i'd prefer doing his usual appearance (if possible).
Kalvin's details:
grey eyes, black hair (being somewhat messy), wearing a black T-shirt and jeans (sry, i'm still working on appearances for the characters T.T), with a silver gauntlet on his right arm (only the arm not including the hand) (it does also have a gem on it but idk where, what color, or shape; its good enough without it until then).
that's all i have planned for him so far and i know its not much to work with, i'll try to update this page with more details.