You have a nice, neutral blank slate to work with. No one can suggest colors in a vacuum - not knowing what you prefer or what is being used in the rest of your home. Maybe look through pics of similar bathrooms and find some inspiration there? If it were my room, I'd find a colorful runner for in front of the vanity, some art for the walls and hang some towels and bars (if you don't already have towel bars installed somewhere). The logical place would be on the wall to the left of the sink so you could have art on the wall to the right? Maybe an orchid in a pot on the counter, or another kind of plant if you have enough light - a soap dispenser or soap dish. Have fun!

I've been thinking about it, too. Try finding towels and a curtain in the same or similar tone that you painted the walls. I think a monochromatic look is more soothing and spa-like. You already have white toilet, sink, and tub. You can add more white with a faux floral arrangement of white flowers. I like your idea for floating shelves where towel bar is (you could put extra towels on it, too). Then a piece of art with white matting and a dark chocolate brown frame. PS - just looked at your pictures again and I think the towels and decor you already have are fine - at least in the pictures, they appear to match the walls. All you need is a lighter shower curtain in same tone as walls and towels, and a more impactful piece of art, slightly larger. And try white buds/flowers idea. I still like your idea of shelves over the toilet.

I like canvas art because I wipe water off easily. Here's a possible scale for yours, with mirror larger than art. Art shouldn't probably be wider than the toilet. Idk if this houzz excerpt helps: "Having lighter colors at the eyeline will help a bathroom feel clean and airy, but try balancing them with a deep color lower to the ground. This adds a sense of richness that helps keep the space from feeling too stark, without making it overwhelmingly dark. Plus, it beautifully sets off classic white fixtures."

It looks very nice! Lots of potential for major charm. :) Depending on privacy needs, some window treatment ideas: Cafe curtains … Cafe shutters … Full shutters … Roman shades … Bamboo shades: Or a simple (but very charming!) curtain … For walls — are you asking about paint or wallpaper? Or wanting to leave the color as is? I could see wainscoting with paint or wallpaper looking great in this style bath, but not sure if you’re wanting that sort of change (or even like that look): For shelves — what do you think about a vintage style cabinet? For example, something like this apothecary cabinet from Ballard Designs: The above comes in white, too. Love the idea of a vintage or antique one: You could get very cute vintage style glass or ceramic knobs for a cabinet. For a rug — so many possibilities! It’s just based on preferences. What styles do you like? Do you want something with color(s) or stay neutral? My own preference is traditional and colorful: But something neutral would look fine, too, if that’s your preference.