Is this just a powder room that's shared with the laundry, or is it a full bathroom?

What is that second picture? Shower wall?

if you are keeping the floor tile, choose a wall tile with the same color tone BUT with a texture for some interest.

https://www.wayfair.com/home-improvement/pdp/bond-tile-auburn-ribbon-24-in-x-48-in-porcelain-ribbed-wood-look-wall-tile-1549-sq-ft-case-sost4239.html?categoryid=2970&placement=16&slot=1&sponsoredid=5e2ec3717bc0e538420d48799a195912ad57db26c34ad572d4efce0714363eb1&_txid=I%2FWEwmadZGRq2OL3ksA6Ag%3D%3D&isB2b=0&auctionId=51a4d742-a1ee-474d-ae2f-fe8bbcebcbe7&piid=65312417

It's a bath

So white or grey marble wouldn't work with that floor?

So I did this

I think It looks good enough

It looks good! Now - where is everything going?

With current renovations, we stopped tiling the wall and just do floor and shower walls.

Really no need for floor to ceiling tiles. The plus is you never have to paint the walls.

In your case, I would remove, sheetrock and paint.

It will be hard to match up your floor tiles.