Hey man, I really like the vines/tree/rock thing. With your paints you should be thinking much much simpler. Don't try to define muscle! Just think of the blocks, cylindrical shapes and spheres that make up the figure and start there. Make sure you have a light side and a dark side and all of your shadows are accurate. You should only go into detail (muscles, folds on clothing, etc) because you have nothing else to do. Then it doesn't take much. The guy's head is the most clearly defined thing but you could push the dark side of it a little darker. Keep up the good work, there's improvement with every post!