The best option would have been a tub with an integrated white front panel and probably one less tile pattern/color in the mix.

Too late to go back on some of the decisions made, so the green tile is probably the best option.

I like the bottom right. (real wood w/fake wood doesn't look very good, so stick w/the white countertop. I do like the seafoam green to match the tile color.

You could just do a simple tub surround in a waterproof or vinyl type of molding instead of tile

White tub, white vanity. Please.

Sorry but the tiles you have already do not work together so adding either is not ideal, what is going on the shower walls ? IMO too many tiles already

None of your mock-ups show what you have. So, bring the wall tiles into the shower. Do a white tub. Do a white vanity. Invest in a gorgeous shower curtain.

Have you selected yet another tile for the ceiling?