My friend has given the task of making this mask she bought look like a severed wolf head for her cosplay I'm making:
This is a simple latex mask, with fur-covered mesh around the latex. My first thought to fill it in was to get a foam head and fill in the rest with that foam-in-a-can that's used in housing. The problem with that is all the airholes and eyeholes in the front as well as the fact that the foam would leak out through the mesh bits.
The back is also very open:
So what is a good way to fill in the mask and give it shape, while also making the part where the neck should be sort of flat so I can put gore paint and effects on it?