It looks lovely. There is a lot of grey so the space may look dark. Just balance out the gray bathroom with some decor in bright white, red, yellow, or orange. I LOVE gray so I may be biased.

I think you've got a great eye!

I like those tiles. Really gorgeous. White vanity will be nice as long as it doesn't clash with the whitish tone in your tile. What colour counter top are you considering with these choices? If you do white vanity, maybe grey tops? Or will the grey have to match with the tiles? If you do a white top, then does it have to match the vanity and the white in your tiles? See where I'm going? I think you might want to take your tile choices shopping with you for a counter material. I think my choice for a washroom would be a solid surface - like Caesarstone or some similar brand (read threads on Houzz for people's choices and opinions on one type over another). Misty Carrara from Caesarstone might work - it looks to be a greyish white background. There are many marble look ones you could look at. If you can find one that pulls your choices together that would be ideal. You know I think I'd love something like a medium tone walnut vanity with a marble look top and your tile choices. I'm struggling to get a picture to attach to this post, but google walnut washroom vanities. They might appeal.