Before he wore the Cujo-inspired retro mask in St Louis, he had Casey Jones from the Teenage Mutant Ninja Turtles on his masks. He also had an angry moose.
https://www.instagram.com/p/6dHyhiOriq/
I'm thinking his new one is the combination of the two, an angry moose wearing the Casey Jones mask.
I'd still like to see a clear view of it. DaveArt usually tweets out photos of the finished product, but he didn't with Elliott's.