Do you want to re decorate? Get rid of so many squares on the floor plus the walls.

Do you want to take the room down to the studs and move things around?

What is across from the vanity? Perhaps a linen closet? Someone will ask you for dimensions.

Is the window frosted or do you need a covering for privacy?

The wallsare concrete so it will be too costly to do anything with them. Giving it a fresh look is fine.

Start with a new top on the vanity we can't see, new sinks and faucet. Mirror the entire width of the vanity, get some decent lighting.

Get ALLLLLLL of that junk of the counter top. Like right now.

If no walls can move, if you can't change the layout? You are limited to cosmetic improvement. The tile can come off the walls, it needn't be that tile. The ceiling fan can be improved or replaced with better lighting. Get some inspo pictures together of what you like. Nobody can pick you a style, a new, vanity a tile an anything without knowing what you might like. First? De Junk.

Is that a linen closet? What about painting the trim white. That will start to freshen it up.

You can add 2 framed medicine cabinets over each sink, and of course change the lighting.

Budget?

What's the budget range for changes? Will it cover: New towels and professional paint, new medicine cabinets and lighting, or new countertop and sinks?

another lime plaster example. A little less rustic than above. I believe these are rated for wet areas but someone with more knowledge than me can confirm.

I agree with Jan as far as the clutter is concerend. Where do you live? In some tropical places concrete block walls are code. The whole space screams 80's and IMO was never a great design era so rip it all out and start over but we need info . Anything is possible with a really big money tree .It looks like you have a wet roomis this something you want to keep ?