Looks like a very well structured reptile, as is it looks lie the bones are visible on the surface of the beast, well it looks like that because it is greyscale only. The beast itself does look quite ferrous based on teeth, and that it looks like a raptor kind of style for dinosaur features nicely done.
It's a bizarre creature in that aspect. I guess you could think of it as a second skin that forms over the body as a protective armor. It is tendon-like and partially armored while still mostly separate from the underlying structure.