I like how primitive it looks. The skull is big and looks a bit clumsy,not very good for fly.The eyes seem to be on the sides of the head, making active hunting or spying food way harder. The limps are still very big, witch alsow impacts flying and is rather good for running on the ground or (maybe) climbing. It looks like a species of dragon that A) goes the way from living on the ground to flying or B) a species of dragon that lived mostly in the air or high places and goes the evelotionary way to live on the ground or in caves.And this bone dragon is in the middel of that evolution, and later just died, while his kind further evolved.