you have many wonderful edits above, and you choose to ignore then.
pay attention to arachine's muscles. especially in the shoulder, torso, and arms. your colors are still to saturated, and lack unification. you are pillowshading. learn not to do that. you need to fix the ambient lighting on his shoulder and head. get a reference for that sort of thing. also, i think this piece could benefit from some dithering. either that or more colors.