What color are shower and sink fixtures? Sink counter material and color? Is there a window? Please show us the rest of bath. Is the wall tile gray, white or cream? I might want to match towels and rug to that color but really need to see more of floor and counter.

White to all questions.

Except soft surfaces like towels, rugs, robes, curtains, and even art: strong solid colors like dandelion yellow, scarlet, jade green, or cornflower blue, etc.

Thank you for the comment. This is a modern Mountain home. Heading to the project now. Will post new pics

Fixtures are matte black sink and countertop are white walls, subject to change

My thought was to use dark gray, but what paint color in that color palette

New pic

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Find a shower curtain with pattern and colors you like then pick a coordinating color (lighter version) found in curtain.

Thanks for extra pics. The back tub shower wall looks much different with the floor & counter showing - in a good way. Don’t mention your sonogram image to guests & put that image into their heads! 😁 I would first try a clear shower curtain so that the wall can be seen - it’s a design feature - don’t waste it. There are clear curtains with graphic designs on them - find one with black design.