I suggest you leave it as is. It’s lovely!

I really like the way it looks now, too. Dark paint colors can be dramatic in powder rooms, but I wouldn't want it in the bathroom I use everyday. You could go darker than white, however. I don't know if this would work with the vanity and your floors, but I used BM Classic Gray in my living room which has a southern exposure. It's light, but not white, and doesn't look yellow in strong light. It sounds like you don't like green? You might be able to find a blue that works, but you'd have to sample to find the right one.

Look at BM Calm. it's a whitish gray. I have it in my house.

or, look at Lacey Pearl

If you want a white, try a warmer white like Simply White. Decorators White already leans very cool, so the green reflection will just make it look worse.

I also think if you brought in some warmer elements like a teak stook, a plant, an orchid on the ledge, maybe a woven tray w/a vase/stems for the vanity, some art on that wall, a throw rug, it would really amp it up a bit.

I love all the accessories in this one

Beth has some great suggestions, particularly Silver Chain, as it works so well with the vanity.

But, if you don't want to repaint, add some art. I like this piece because it also relates to the vanity (love), the floor, the natural light bringing in a green cast in the summer. Buffer it all with the warmth of creamy tones and the bright white bits, which give a nod to Decorator's White.

This piece is from greatbigcanvas framed in black with a silver accent.

love that art piece for that room! and the darker towels. throw in a teak stool or window ledge and it would be complete! (and a plant of some type. lol)

Dont paint it a dark colour it looks lovely. buy some dark towels