Several people, for example, have 5 to 20 photos of their son or family at the same outing. It’s those redundant photograph I’m talking about mostly.
I would say, keep the photos with the most context, look in the backgrounds of photos for items, and things that are interesting, not just the main subject. A photo of a person standing in a field would be much different than a person in a photo sitting inside of a house That they own.
And you are right, I think the rarity of the photos is what makes them more beautiful, more valuable.
If you have any guiding principles based on which to answer this question, I'd love to know them.
There is one photo in existence of my great-grandfather. That makes it the most interesting photo of him by default.
There are hundreds of photos of my son. Which one(s) should be preserved so my great-grandchildren in 2123 can still see them?