I think maybe you can tell a bit about a tattoo artist by the type of pinup they tattoo. Kelly Gormley for example, who did the three tattoos below at Addictive Ink in Albequerque… I have a pretty good idea as to what kind of boobs they like!
That said, most of the time I think pinups are probably based on existing artwork; here’s a few examples care of The Comedian Tattoo in Scotland: