Paint and art on the wall : ) can make a huge difference.

How about wallpaper?

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it looks like the tub was set wrong because the tile should be over that flange around the tub deck. There should be water resistant or waterproof backer board behind the tile but this looks like acrylic tub surround was put over sheetrock. So I would not worry about the color clash but the waterproofing which could lead to mold problems. It is hard to tell if you could just put thin backer board or that Kerdi waterproofing right over the faux marble acrylic then tile over it and the flange. If that is real tile or stone, maybe you could run a decorative border tile to cover the flange. A better but more expensive solution would be ripping out the tub surround, putting in the waterproof backing then re tiling properly with silcone caulk at the tub edge. That will flex when the tub does. when filled with water. (fill tub and then caulk for best seal.) I would tile to the ceiling.

After the water proofing issues, deal with the aesthetics. if you keep the faux marble, I would find a warmer wall color to match the veining which looks beige or taupe on my screen. I might add border tile to trim the surround. Wall decor depends on your taste. mural ?

If you don't like the paint, repaint it ... the tub is white and the tile just has grey veining, so most any color could work. Or are you hoping to remove the existing tile/tile the whole wall? As for hardware, what do you like? A good plumber can easily change the hardware for you. The towel bar might need you to do some minor wall repair if you can't find one with the same span.

You say it's a weird layout, but you've only shown the tub. Whats weird about the layout? What's the rest of the room?

It’s a very narrow bathroom. Usually tub is by the window. I’ve never seen a tub in a weird placement by the wall with the backsplash ending where it does. I think I will paint white or a pale gray/white. Maybe add light fixture? Was thinking black or brass:gold hardware