Quibble: I hate, despise, loathe the dilution of the word "rare" to mean, well, in this case "somewhat interesting and not commonly known".
Photos cannot be rare. Physical copies of a photograph might be. Photos are by their nature singular instances of artistic or technical action, so all of them are equally rare.
Photos cannot be rare. Physical copies of a photograph might be. Photos are by their nature singular instances of artistic or technical action, so all of them are equally rare.