To parrot some of the other comments, the holes needed to hang artwork and photos are very easily covered up with a lil spackle (or even toothpaste!) and paint, but also command hooks work very well for hanging things even up to ten pounds, and come off cleanly if you remove them slowly and according to the instructions.
I’ve hung paintings in spots and later decided they don’t look right there and moved em. Sometimes it’s helpful to put it up to see how it works in the space and move it later.