In an answer that I recently wrote elsewhere on this site, I posited that photographs are used by J.K. Rowling in the Harry Potter books as a device to portray the subjects of the photograph in a specific light. I wrote that answer about Regulus Black, who was shown "smiling and waving" in a photograph before readers are told that he died hunting Horcruxes.
I recall (but don't have the books at hand) that, before Harry and the readers are told that he was a framed good guy (and are made to believe that he betrayed Harry's parents), Sirius was shown only by his mug shot, as a crazed and evil-looking man.
Is there evidence in the Harry Potter books to support this theory? Is there any evidence against? Just because someone is evil (or a supporter of Voldemort) doesn't mean that they can't look friendly and nice in photographs -- has any Death Eater or other "bad guy" been shown nicely in a photo?