Do you have ordinary photos that you want to turn into works or art? Here’s plenty of examples of photos mainly from the mid 80s that have been made to look antique or painted. They were film prints scanned on an old scanner so there were many little dust spots or scratches eliminated in Photoshop and then to make them look painted, I used the dry brush filter and sometimes the watercolour filter too. To age the other photos, I adjusted the value levels, adding in more black, more white and lightened the midtones. I also didn’t push the saturation all the way down to zero but added a little green to them as my local photo printer tends to print grey with a slightly pinkish hue that I don’t like. The last seven photos are digital.
I’ve noticed with a lot of home decor photos online that when making a gallery wall, that a lot of the photos are quite light instead of having a lot of black and many do much more than 30% negative (or white) space so I’ve been experimenting with that too. There’s lots of little painted landscapes on bookshelves now so I’ve been seeing if I can make my own. It works out to be a lot cheaper.