I really like how you have done the skin here, rather than making it over fleshy or too dull it looks somewhat leathery (again maybe the lighting but I doubt it). It looks a lot like what non scaled lizard skin looks like, the skin of a cold blooded animal. You don't seem to have used too much wash on the skin seeing as it's a large surface and (just thinking logically here) would darken any highlights you added in the previous stages of shaded. I do suggest though that you attempt to add some blue, gray wash to the recessed areas of the skin, for example the muscle on the legs, a narrowed down area which if you've used to much can me dried up quickly with a paper towel...
hope to see some further developments and the howdah!