One should take care that key details are not cropped.
The first image in this post contains a cropped picture of my great-grandfather, Fred Ufkes.
It turns out in the background, very faint, is the church which was a few miles from their home.
If I had not already suspected where the picture was taken that church would have been a big clue.
Your archival scan of a picture should include the entire original image.
There could be clues hiding in what appears to be "background."
[note: pictures were shrunk for this post as I'm close to using all my Google space.]