Start off with covering a blank mask with a coat of gesso and set to dry. Then it will need to be sprayed over using plastic fusion-spray paint in black or white and another coat of gesso. Before adding another layer of gesso, use sandpaper to roughen it up a bit.
Let it dry thoroughly.
In order for the mask to please your aesthetic, use a contrast of vibrant and burnt hues in acrylics and play around with them- decorate your mask in whatever way you like.