Looking really great Stu, I can't believe how much you've progressed on this.

A few crits, all of them minor and constructive:
The head looks heavy, which means the neck must be suitably thick in muscle to support it. Just that jawbone must weigh quite a bit. I think the neck needs a bit more "girth" to support that weight. On to the feet: can the balls-of-the-feet really support the massive weight of this creature? (I'm really asking, I don't know ) He seems as if he might tip over in his present stance, although you've done an awesome job on the muscles in the legs!

Those are just minor crits bud, hopefully to help you towards perfection, do with them what you will.

Yeah, gidgit is right, remember to pock-mark him up when you texture, remember that he is ancient and has been through alot in his existence.

Brett