Hahaha, actually, my Halloween costume is usually terrible. xD I work in 2 haunted houses, both as an actress and a makeup artist, and so by the time I'm done making everybody else up, I usually have, at the very most, 10 minutes to get in costume and makeup.
Sounds like the perfect job for your art though. On Halloween me and my friends dress up as zombies (I'm the one doing to make up cause they're lazy but..) but our make up doesn't look nearly as professional. In order to pull off the "rotting skin look" we use shredded toilet paper.. haha