How to tag a Photo point?

But you mentioned =outlook_frame before Wie einen Selfie Point eintragen? - #42 by OSM_RogerWilco
Have they actually checked what’s =photo_location is used for? Such already low numbers don’t mean anything without the same usage. The 1st example I look at is immediately wrong. Node: 4517312056 | OpenStreetMap File:Salzburg Skulptur vor Markuskirche.jpg - Wikimedia Commons
I would have thought =photo_location is a board or statue with a hole at the figure’s head for you to look through, as asked in the other question. I will comment there.
Another concern is confusion or misuse for subjective good photographing spots, and =viewpoint , similar to Maps.me spam . Also, there are “tourist trap” services taking photos for you and printing for a price.