his right lover arm looks little bit off, and his chest should be more curved, or i dont know how tosay it, in another angle, its now like a 2D chest with kinda great shades. Also i don't have any models, so i just randomly start to draw the skeletons of ppl. do sketches of people just in stick figures, how they stend or sit. Then after learn about skeletons and bones. And the next step with your sketches should be drawing on some bones, but for that you will need some experience with skeletons. This is my advice, i hope you can understand it and will watch you upgradeing/evolveing