Poster Gallery Wall
Instead of making holes in the wall, either use command strips to hang lighter framed art prints, or stick unframed art prints to your wall. Gallery walls look amazing over a bed, couch or across a hallway wall.
If you only want to make a couple of holes, consider hanging an art shelf. These sturdy shelves are made to hold several pieces of art and a couple of smaller home decor items such as candle sticks, books or small bowls. Stagger the sizes, and add perhaps layer three or five pieces of art on the shelf (try to work in odd numbers as they look best).
If your landlord is a little more strict, creating a floor gallery is a fun design opportunity. Place different sized art prints on the floor, or a small bench/box to create some height variation. These galleries look amazing in subtle neutrals for a more Scandinavian look, or with bold colours to create a focal point in your space.