Been playing around with 8-bit camera apps lately, and my favorite free one so far is Famicom Camera. It’s pretty straightforward, with only options to change between 27 and 64 colors (most of the pics on here were taken with lower color rate), some retro borders, and the thickness of scanlines.
I’ve had a chance to play with it with multiple subjects, and it works great for creating dramatic chiaroscuro but loses a *lot* of detail, even for 8-bit art. Still, it lends a very distinct look to photos, resembling more the graphics of, say, a PC-99 graphic adventure game. Really cool stuff.