What a great space to highlight a special sculpture. I'd pick a tall sculpture (personally, I'd go for a light colour stone/timber sculpture) that suits your home style and then using LED uplights to highlight the sculpture.
what's on the other sides of the walls?
looks about 1200 deep and about 1m wide? what about repair the floor to match and install a wall to wall desk with drawers, chair and shelves for a tiny study area or add doors for a powder room, walk in storage area and or coatroom
Storage, linen. etc. Something all 1980's dwellings seem to be missing!
here's some pics off HOUZZ