For whatever it's worth, I agree with bvanant. With the photo exhibits I've seen it appears that the 'standard' style is to sign the matte in pencil with numbering for limited editions if you are doing that. But in my opinion, a title seems a bit pretentious for a photograph. To my mind, a title implies that the artist had a statement to make, and created the art to fit it. The genesis of photographs is usually the opposite. I guess I liken titles to nicknames: (if I may borrow from Jim Rome) It's bad form to "self-gloss."
Of course all of this is just my opinion.