As usual, mine looks like a strange teenagers room,
I really like old junky pictures from charity stores (op shops to Australians)
Especially old European buildings or towns, and sea faring pictures, and catholic art.
You can see a couple of framed photos of Gaudi buildings, which I love also.
A Charlie, lucky, I reckon stair wells are the best place for hanging, and hallways.
Re permission, I was lucky enough to never have that problem, the only ting holding me back has only ever been enough frames.