I like the current white! If that’s just primer, I’d find a white that matches that color. Looks nice and clean.

Are we not going to talk about the man lurking outside your window?

Sea Salt

First of all. to LA’s comment…LOL. There is a man lurking outside your bathroom window.

Seriously though, have you thought about going a bit darker? Perhaps a silver or grey tome that works with the veining of the marble and flooring? It can be much more interesting than simply going with white.

https://jarretyoshida.com/

Hahaha, guy was installing the window.

I agree with SW Sea Salt if you want a subtle color. What color is master bedroom?

SW Dovetail might be one to consider.

SW Agreeable Gray … very versatile color.

SW Dorian is interesting:

A pretty green:

A vibrant green:

If you’re wanting more saturated and/or dramatic, there are lots of blues and purples that could work. Several greiges, too, if you’re wanting warmer than all gray. It’s hard to know for sure without seeing your other rooms, and what you’re going for.

I’d just do lots of searches, like ’Sherwin Williams bathroom colors’, etc, to get some ideas. And of course do test swatches.