Just made one of these. Get a plastic face mask so you know how to put it on your face. Take sculpy or model magic and cover it, making sure it's just a dome shape (no points of inflection for nose etc) but leave one eye open in a circular fashion. Then take a knife or nail and push lightly into the clay, making the circular thing around the mask. After baking if using sculpy, you can paint it. The mask is not hard to breathe in, but makes it very humid.
Bring the rain~