What you'll need:
2x4' of 4" foam (I used upholstery foam)
3/4 yard faux fur
small pieces of accent fabric
2 glass eyes
Step 1: Sketch and gather materials
If there are any areas of your mask that stick out - like the nose, ears, horns, etc - plan on constructing those elements separately to help minimize the size of the foam you need to purchase. For example, I carved my bear's muzzle separately and then glued it back onto the head.