How much work are you looking to do? I would paint everything over. Possibly a warm white. Id add moldings to the wall either shiplap or regular moldings. A new material sectional you can probably keep your rug. I like it. I also like the coffee table possibly but I guess decide on that later on. I would also do new shades on the windows

This looks okay if you are young and don't have many personal items. As you age you will collect items that are more personal: framed photos, artwork from travels, your great-aunts favorite Navajo pottery. Estate sales are wonderful for picking up unique decorative items and artwork. Also, as already mentioned, books.

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.

@la_la Girl Thanks for responding. Many of the choices are either busy via matching floor and wall tile or smaller tile like 8-9 inch hexagon on the wall or floor (I'm personally not a hex fan). We're considering a lighter version of the current floor tile (the one on the left in this picture). But then I don't know if that'd make the bathroom a little too boring with the shower tile and if the undertone still works as well?