I'm sorry not to have sent this earlier, as now it seems you're out of time, but depending on whether you're talking about the film "The Wicker Man" and specifically the recent remake, the maskmaker behind for the designs for the masks in that film was Monica Roxburgh of Goblin Art, very talented, well-known and found at http://goblinart.com/ - although her studio is closed for now.
Otherwise, you might look at what maskmakers have the aesthetic you're looking for, and what materials you'd like - deer are such striking animals that many maskmakers tackle the subject, and you ought to have your choice of designs already, and your choice of willing artists if you want custom.
I hope you found what you were looking for, but if not, I hope this has helped, and happy Halloween!
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