I like the tile up the wall with the lip. Shower doors may make the room feel a bit larger and big colorful art on the wall straight ahead would look nice. But I am not loving the grey walls and brown/tan floor. I would change one to match the other.

Did you know that there is a Bathrooms forum and also a Home Decorating Forum? You'll get the most responses at Home Decorating, I think.

The bathrooms forum is mostly how to design, build them and fix them ... Home decor is when you are not messing with pipes and stuff.

Does that floorboard have mold? If so, that looks like it might be bad enough to have the tile looked at too. That might just lead you to do more than decorate or paint that room! I'd address that first.

Don’t mix gray and tan. It doesn’t matter if there’s gray striping in the tile. The overwhelming color of the tile is tan, which clashes with gray walls.