I kinda disagree with EnactJudo and therefore I guess you. I don't think there is anything wrong with having arms straight down if it expresses something, and to me I think it makes sense. It's AFTER a battle and there is NO ONE around, why would he waist his energy with his arms in the air. I think it could add to the effect by having his head down but honestly I don't think there is anything wrong with what you have here. I think you can decide if this is what you wanted it to be, all I know is you don't want him to seem like a wimp. I like it and I like your style.