The Photography SE Help suggests that old photographs and identifying the people making and featuring in them may be on-topic here:
- history of photography
- photography in society
but I suspect an in-depth analysis of the people in old photographs, and their lives (family, friends and place in micro-history) may not be.
The Genealogy & Family History SE (G&FH SE; which is still in Beta, and where I am a pro tem moderator) often uncovers old photographs, and its users are very interested in the people in those photos. Researching them often involves learning about the photographers and their studios which brings G&FH SE users here. That site would love to help Photography SE users with researching the lives of the people in their old photos.
I think there is much potential synergy between Photography SE and G&FH SE and, if you agree, do you think its posting of a Community Ad candidate (that still requires two votes, before it can start to appear), is the best way to try and promote awareness of what can be gleaned from people in old photos, by their owners posting questions to G&FH SE?
This is that Community Ad candidate (which you can click to see examples of
photo* questions that have already been asked there):