Looks very good so far and I'm excited to see the modelling. The only thing at all that throws off the drawing for me is the little decomposed portion of the tail. I think it'd be cool to expand that and have other portions decomposed as well. Like maybe some of the muscles in one of the legs, which makes him walk with a limp, or maybe some serious wing damage. Its hard to crit something so well done. Can't wait to see more.