I prefer cards as opposed to photos. However when a photo is being signed, I definately don't get into the "candid" shots. As far as I am concerned by signing that photo, the actor is "authorizing" the shot. If they are signing something that is poor quality and doesn't show case thier work......well then I don't care enough to bother with it. In case of most candids they are not great shots, and usually have no true context to any of the actors work so whats the point.