For instance, the upcoming Sgt. Rock portrait was loosely based on singer Henry Rollins, Batgirl was loosely based on Kiera Knightly, Harley was loosely based on Katherine Heigl, etc. I emphasize "loosely" because there's a bit of stylization that occurs (and there are obviously no rights in place to produce likenesses of those people). For other more comic-based portraits like Shazam, Green Arrow or Sinestro, the art director will generally just give me a couple clips of art to go by and I'll use that as a starting point. There's less artistic freedom with these sculpts than you might think, the art directors are often pretty specific about the looks they want. But they are fun to work on.
