I didn't really keep track for the subsequent series, but I was (and am) amazed by the paintings and other images that the crew hung in their quarters. So often (aside from Data's work and the art studio scene with Picard) they're space-scapes or starships. I know why. To remind us that -- OoooOOooooh! We're in SPACE! But if I were on board, something I could see out the nearest porthole would be the last thing I'd spend a single replicator credit on to put up as a poster. No, I'd want scenes from my own planet. Or family. But what's your in-universe explanation?