I was hired to draw caricatures for a birthday party, and the client asked if I would draw Mick Jagger as a special present for her hubby, because they both "love" him.  She wanted my b/w party style with just his tongue colored, reminiscent of the Stones famous album cover, but it looked rather odd, so I just decided to color the whole thing.  Prisma  is a very quick way to color, as opposed to my time consuming watercolor pieces.