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.

Neutrals would look really great in this space!

Simple answer here....add some color!!

thanks for the ideas! i like the bamboo blinds and the wainscotting ideas.  i will incorporate those for sure.