What the sitters wore can also help date a photograph.
Other trades included a hosier, watchmaker and jeweller, piano tuner, hairdresser, surveyor and draughtsman, and a plumber. Women were said to be better at photographing children.
Broadly speaking the younger the adult the more fashionable their dress and hairstyle are likely to be.
However, bear in mind the social class of the family.
If the backs are numbered this would be done in sequence.
Printing dates are sometimes given, but most proprietors advertised that negatives were kept and copies were always available, so in one case I have a carte printed seven years after the sitter had died and an identical one printed ten years earlier.
I have retained the spelling of place names, as they appear in the directories.