I really like the idea of having each photo as an item! Really adds to the collection aspect, in case the gallery doesn't work out that's also a great option! Another thing that could work is if the ghosts' photos could be uploaded to Nanori's computer gallery, maybe they could even be interacted with from there like virtual pets or something, but I'm just brainstorming here.
I understand life can be pretty harsh sometimes, it's import that you take your time on your own pacing, and I'm sure whatever comes up in the future will be awesome because its made with heart.
Wishing you well in life, and that you can enjoy your experience making art!