Here are some thoughts...
I'm not sure a relay dedicated to photography would help much. Relay selection is not flexible enough in most clients. It might make sense to have a dedicated relay in combination with an app (or it could use a new KIND for photos are it's own thing on existing relays).
A marketplace for photographers could go into two directions:
- A public stock photography site that sells images (see istockphoto.com)
- A private client gallery where photographers sell photos from photoshoots/weddings, etc. (e.g. https://pixieset.com/ and hundreds more).
For both usecases there are already a plethora of options.
There are a lot of photography communities already - it would be very hard to build a community on a new platform. Ideally we would have a generic nostr based forum software that could be customized to the usecase (e.g. like www.discourse.org, phpBB, ...). Someone should built that first :)
The Instagram type app is something that comes up every so often. The need for a photo focus app let me to build slidestr.net. The thing is, I'm not sure a generic social photo app will gain much traction today.
It worked in the past with Google+ (a lot of photographers joined there), Instagram (fixed square format + filters), 500px / flickr, ... but it needs some clear advantage
over the existing solutions for people to switch.
Today most photography is done on mobile phones, i.e. I think people expect to use a (native) mobile app. All the PWA / web app stuff is to cumbersome for people.
A combination of the community and the app idea, could be a place for photography challenges (e.g. like https://52frames.com/albums/2024/week-42-on-the-ground/challenge ) where people post their work for daily/weekly/monthly challenges or projects regarding a specific topic. This would be a kind of learning community with image galleries.
Topical relay is the best solution if clients would just allow us to do it…
I'd be open to exploring more possibilities that could work well within the Nostr platform, particularly in the photography space. You've made some great points here; open to work together on this