Replace the shower head for starters.

Can we get a new vanity?

Shower curtain.

Want to add peel and stick to the floor tiles?

Inspiration

I would make it function well, floating shelf & robe hanger, cool washable carpet, and a nice shower curtain. The white with the floor is ok, but a turquoise influence would be cool

The first thing to go would BE the tile. Why? Can't be more than 50 sq feet! The vanity IS the storage as far as we can see, and you probably could paint it a color, or simply buy new. I'm sure you'd like a top upgrade with under mounted sink.

The rest? You use the back of the door, some shelving above the toilet. And you give her a make up area in her bedroom : ) to limit the junk and an easier tidy up when there are guests.

Pick a tile, a color.........and go with it.

Light it up

Or.......leave the floor

change up the vanity......

Start with a shower curtain

Throw down a runner

Add some art to those walls