This is one I've been wanting to do for ages since I started making masks in this "plain" (well, unpainted) style. A Minotaur/gas mask hybrid. While it's not quite what I had in mind (look, you can't make leather support brass horns that size. At least, not easily.) I'm still very much pleased with the result.
Media: Leather, with brass riveting and brass mesh screens in the nostrils.
This piece has been sold. If you're interested in commissioning something similar, just let me know.