Pretty good. If this is meant to be realistic the proportions are way off however. For example, his legs are really short. Obviously if it is not meant to be realistic then you can use whatever proportions you want.
Also, it looks odd to me the way his chest is sunk in. I would divide the edge down the middle of his chest and pull out the new vertex in order to shape the chest better.
Also, it looks odd to me the way his chest is sunk in. I would divide the edge down the middle of his chest and pull out the new vertex in order to shape the chest better.