This is a photo of light novels for sale. Could someone please identify every light novel in this photo?

Yo! If you want better help with this you'll need a better res picture. As it is, a majority of the names in these are very blurry, and with the pic being more than a literal full shelf's worth of LNs, the request would be unrealistic on top of very time-consuming.

You can barely see the titles of most of these, which aren't in English either. Not that that's a problem for me specifically, but honest - you can barely even try to read the Japanese anywhere in that picture, the kanjis get blurred out too much.
I can tentatively tell you the names of at least two of them:
If you start from the top left, the first thing you see is the ＂Migawari Hakushaku＂ series - which ran from 2007 to 2017. https://anilist.co/manga/94532/Migawari-Hakushaku-Series/
And in the middle you can see ＂Sawayama Monogatari＂ (佐和山物語), which there seems to be barely any info about. https://www.amazon.it/Sawayama-monogatari-Ayakashi-yashiki-konrei/dp/4044545014

Maybe we should update the rules. There is the rule not to ask for multiple, different characters in one post, but to make one for each (probably like different series etc). Imo it depends, if it is a magazine cover with a few it is fine.

But in all honesty, posts like this should not be allowed when it is asking for all of them.

Anyways, girl with the twintails should be from Maria-sama ga Miteru

Honestly agree. A rule update would do us well. ^^