Above: Dragon mask
Mythical masks is a website that features a large collection of handmade leather masks inspired in fantasy perfect for masquerade balls, ren faires and fantasy festivals. Masks come in different categories and collections from birds (raven, owls, peacock and more), animals, dragons (western or oriental) to elementals, mermaid and ocean inspired, green men and fairy inspired masks.
If not enough it includes also the possibility of making a custom order following your specifications. I particularly love the butterfly and moths ones as they show a great delicacy when trying to mimic certain species painting the color patterns of the wings as in these:
Above: moth mask