You want something soft and white, like current look, or a bit of color and pattern? Modern or traditional? Need more guidance

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A start, anyway.

Excellent job, love the sea salt!!!

Looks great. I especially like that you painted that soffit/firdown all sea salt too! I would go all white in shower curtain and towels. Maybe a few hand towels to match wall color. Looks very calm and serene!

Following

Like the wall color. Good choice. Goes well with the colored stripe in the tub/shower enclosure.

You might consider a bracket centered above the window for hanging a small potted plant. Alternately, a bracket can hold a basket with for items you want handy for tub/shower use such as shampoo and body soap.

Unless you have a light above the tub, a single heavy duty clear shower curtain liner works as a shower curtain.

Good idea with the mini-blinds for controlling light and privacy.

For a short window, I'm fond of a swag valance hung on a rod slightly wider than the window so the fabric covers the window frame -- top and sides -- leaving as much glass and natural light visible as possible.

https://www.hooksandlattice.com/pots-planters/hanging-baskets/hook-hpt.html