I almost always draw portraits of my characters, but rarely use existing art as my starting point. There is at least one notable exception: I own a t-shirt with a portrait of Joan of Arc drawn as a crow, which was part of a series of corvid versions of historical figures by the same artist (the guy who ran Ebon Aves). That art inspired a tengu cleric that I played in one game, and later my tengu cavalier in PFS. The latter would have been a paladin if I hadn't already had one in PFS.