Your tile looks great. If it was my kitchen I would not tile above the window. If you could replace that can light above the sink with some type of slightly blingy rectangular or oval semi flush mount light that might look nice. Here are just a few random ones I found (sorry if the pictures are too big). I'm sure other GWers could come up with more options If you didn't want to do a light fixture some horizontal art work piece could be put in the space.

Please tell me how you’d design the backsplash in this kitchen. I need help picking tile and layout behind the sink. The floating shelf is temporary and can be taken down or moved. Thanks for any input!

Pick a tile first. Then pick the formation. Do you like any of these? https://www.tilebar.com/mod-white-12x36-3d-matte-ceramic-tile.html https://www.wayfair.com/home-improvement/pdp/ivy-hill-tile-arctic-white-1-x-3-marble-stacked-stone-mosaic-wall-floor-tile-sost4554.html https://www.tilebar.com/kenridge-ribbon-gray-24x48-matte-porcelain-tile.html https://www.wayfair.com/home-improvement/pdp/ivy-hill-tile-florey-random-sized-marble-random-mosaic-wall-floor-tile-sost4685.html

Thank you beth H the marble is double sealed. . It is honed. i tested it thoroughly before install with everything. No staining , if lemon or ir lime is left for a long period of time ( neither of which I use regualrly) it will leave a light etch, but with the honing, it really is non existent.. I had to bend over and twist my neck while holding the sample in the right light to even find find the test etch. Oiils, sauce, , butter , etc…. no staining at all!! I had a few cutting boards/ serving boards made from extra marble. I actually have this same marble on a custom sideboard I had made 9 years ago for my dining room, but it is polished on the sideboard. the sideboard is now in my living room, as we removed the wall for kitchen renovarion,, so it lost its home in the DR- LOL but, it works in the LR, so its fine. my shelves are chantilly lace- not wood. It just wasnt the look I wanted. I have a clear water glass sconce with chrome hardware for over the shelves and 2 large matching water glass pendants for over the island.