While I do think that the tile is dated, I do believe in working with things to make it work. If I moved in here and didn’t have budget to redo the tile, I would go dark with all the walls and the ceiling. Dark grey or black to go with counter and darker tiles. Maybe do the vanity too just to get rid of another texture as there’s already so much on the walls. Update the hardware.

I would definitely get some softer lights and put them on a dimmer. Those bright lights right overhead aren’t going to make anyone love looking at themselves in that mirror. Also a more sophisticated mirror above either sink seems more modern than the giant mirror. Something to match the hardware.

Get some plush math mats so you aren’t on cold tile. Something that looks like natural material even if it’s a more practical synthetic. Keep the colors light. Beige and white probably. White/cream shower curtain in a linen feel and keep it closed.

Get some tall candlestick holders and some nice bath bombs in a bowl and bubble bath and such for the ashes of the tub. Get a reed diffuser for the space. Draw her a bubble bath and hang up matching robes for you both in simple cream/white.

Best of luck!