the last step in your animated lion pic is a cavity map right? is that how you got all your detail and brush strokes to show up so clearly? I am still learning zbrush so I want to make sure.
It looks like the jaw is a little wide on the skull. In human skulls,the width of the jaw is usually about the same as the outer edge of the eye sockets-- it looks wider once the muscles, glands and fat are on top of it. Of course, the needs of design should always trump anatomical accuracy, so if this skull is designed for a certain character with an exceptionally wide jaw, then ignore this advice.