I can't design a mask and say to someone else, "Just do it." It's partly because I'm a better sculptor than I am a drawer. Considering the amount of time it would take me to draw exactly what I want, I might as well sculpt it. I paint most of it too. It's incredibly time consuming so I end up turning down a lot of jobs I want to do.
As quoted in "The Lively Arts" in Connoisseur No. 219 (1989), p. 72