No need to damage your walls. Use no-trace hard wall pins. They are easy to attach to almost any surface, are easily removable, and reusable.
So called “salon” hanging style is a trusted way of composing smaller paintings on your walls. Instead of placing one painting per wall, make a composition of several.
Mix paintings with photos or other objects. Create your own personal assemblages on walls. Change your compositions from time to time and enjoy new designs.
I just did it in my studio. So much fun!