I would say keep it simple, give his body a bit more definition and shape. (Remember he's a lean creature. You can accomplish this with a little bit of polygon tweaking.) Also, I like the texture on the most recent model. Do you think you would be able skin him with a nice smooth orange/red color set as in the original concept art? You could reduce the opacity on the texture, but the style of the game makes me think some nice smooth colors would look a bit better. Great work so far! I'm a poor hand with models and textures myself, so you're already doing well in my book.