I'm currently making a graphic novel which involves stories from other people. I have asked their permission, granted in writing, to use their stories, what name they prefer, and asked how much of their likeness I can use as well as given then the briefing on using my own artistic license. What else do you have to worry about when collecting stories through interviews? How do you navigate these situations? If the book were picked up, is it expected that the interviewees are given money or a polite free copy of the book considered fair?