You're both the artist and the craftsman -- that you do both doesn't lessen either. One of my friends knit a Rose of England tablecloth from a commercially available pattern (sadly I don't know the name of the designer, but she would). There was much oooh-ing and aaah-ing; she pointed out that she'd just followed the instructions, as the craftsman, and that the artistry was in the original design.

Sure, the thirty-fourth Anubis mask you've made from the same pattern you can make by rote, but the design is still your art. If I learned leatherworking and copied your Anubis mask, it would still be your art. When Cirque makes plastic masks from your pattern, it's still your art, though sadly lacking for craftsmanship in the implementation.