I sold my first print at Deviant Art today. It's a drawing/painting of Ty Cobb. I've had a couple other request for prints, which I turned down, since one was a copy of a photo of Natalie Portman, and the other was a conglomeration of Amy Lee photos, which are probably both Copyrighted.
In the case of Ty Cobb, the photo was taken almost a hundred years ago, and the Detroit "D" in the photo hasn't been used for almost as long, so I don't think I'll get any complaints. One thing I've seen is that a lot of people do is sell prints of their drawings done from photos taken recently of some actress, or actor. I don't have a problem with that, but I wonder if anyone ever had trouble because the photos are most likely copyrighted.
Feeling sorry for those critics who talk nonsense in the hope of appearing well-informed.