Please add:-
i) Thou art not required to put names or dates on the back of any of thy family photographs, but if thou dost, thou shalt label them "Dad", "Auntie Annie", "Sukey", "on holiday at Weymouth", ... or anything else that wilt be totally useless to anyone who wistest not who wrote it.
ii) In any group photo, thou shalt always have a different number of names per row than in the picture. Thou mayest name them left-to-right, right-to-left, front-to-back, or back-to-front as thou wishest, but shalt never state which convention thou art using, nor shalt thou use it consistently from photo to photo.
iii) Thou shalt use an arty printing method which rendereth illegible any useful writing (like house numbers) on the print. Where it causeth mischief and confusion, thou shalt require thy photographer to print the picture back-to-front.
iv) Should thou commit thy postcard to the Royal Mail, though shalt use a stamp from the wrong reign and require the postmistress to smudge the postmark to obscure the date. Alternatively, thou mayest post thy card 20 years after it was taken, in which case thou shalt ensure a clear postmark.
v) Should thou breakst one of the above rules, thou shalt leave all copies of the photo on a sunny window ledge until they fade to the point of invisibility. Thou mayst do this anyway.
vi) When thou pointest out people in a photo to a researcher who managest to catch thee before thou leavest this mortal coil, thou mayest do so only at a place and time when they hath not anything accessible on which to write notes.
Chris (looking ruefully at a big box of photos all marked in obedience to these rules)