Light blue tiles, white basketweave floor, oak gray cabinet. Definitely a lot going on in this space.

I don't think I would scale down the vanity if this is your main/only bath. You need the storage. Consider a vanity that involves more drawers, which make more efficient use of the under-counter space than cabinets do, but otherwise just get lots of organizers. I would not keep the black top with your new color scheme; many vanities come with tops anyway... https://www.houzz.com/products/eleanor-bathroom-vanity-with-carrara-top-charcoal-gray-30-prvw-vr~46313451 https://www.houzz.com/products/sheffield-30-single-vanity-white-white-carrera-top-undermount-square-sink-prvw-vr~50578811 https://www.houzz.com/products/30-single-bathroom-vanitygreywhite-polymarble-topsquare-sinkfaucetmirror-prvw-vr~28553083 https://www.houzz.com/products/zola-vanity-base-white-with-mirror-top-ceramic-faucet-polished-chrome-prvw-vr~28557438 https://www.houzz.com/products/modetti-provence-cottage-bathroom-sink-vanity-and-mirror-setlight-blue-34-prvw-vr~78795471https://www.houzz.com/products/fresca-livello-30-teak-modern-bathroom-vanity-with-medicine-cabinet-prvw-vr~86624448 https://www.houzz.com/products/fresca-torino-30-light-oak-modern-bathroom-vanity-integrated-sink-prvw-vr~99355302 You need to decide on your vanity style and color before picking the countertop -- do you want it to blend (gray or white) or contrast (colored paint or natural wood); do you want really modern, or just a little trendy feeling, etc. I gave you a range to help you brainstorm. Hope this helps!

Since you seem to love this tile, what about trying to use a white caulk in the corners instead of the contrasting color. It may make the tiles look like they fold into the corner. You can try this before by just cutting some strips of paper and taping them up , then step back and see what you think. On a side note - was the floor tested for water? Those tiles are too big for a regular shower drain - it probably should have been a trench drain, unless there are diagonal cuts through the tile pitching them all to the drain ( can't tell in the picture ). Be careful moving forward - there seems to be some incorrect things happening here. Good luck!

Schluter makes inside edging the could have used in the shower inside corners and along the base. Do you have photos of the shower before the tiles were installed? I’m concerned about the waterproofing.