This is an existing character from the game 'Okami' named Amaterasu. She is a white wolf that you play as.
Everything on her is custom sculpted and hand sewn. The claws and pawpads are cast in resin/silicone. The base of the mask is cast resin with fur over the top. She has a moving jaw (activated when you move your own jaw) and hand sculpted taxidermy teeth and tongue. She is complete with her shield which is made of Worbla with a insulation foam core. A walkthrough on how I made the mask can be found here.