I'll make the simple blanket statement that I'm a huge fan of top-down-bottom-up shades in the bathroom, especially over a tub. The top-down function is especially valuable for allowing natural light while still affording privacy. If you have bathroom lighting that can result in silhouette shadows being cast on the shade, the honeycomb cell type of shades are great at diffusing shadow lines. I'm no designer, but I'll toss this out and let those with the eyes for pretty things hash this out...would those windows and walls benefit at all with longer shades that can extend down beyond the window sill and just cover the top of the wall tile? Or will that be too sloppy?

I screwed up - it's a master bedroom and bath in the basement with walk out. You are 100% correct with the confusion. What I've decided to do is to have this be more of a "guest master bedroom" or future inlaw place. Every home is initially designed for the current occupant but also with future occupants in mind. Therefore what I'll do is focus on the upstairs primary bedroom and then if I do decide to stay, I'll give this to my soon to be teen-age daughter and I'll build my primary bedroom in the basement. When someone comes to look at the home to buy, they can look at the downstairs as a large "room" which could be a bedroom (staged as such) and an awesome bathroom ideally suited for a bedroom or just an awesome entertainment room.

Non functional and below are instructions on how to make, if you are handy https://www.artsychicksrule.com/no-sew-faux-roman-shade/ Ikea sells roman blinds for $40 that adjust to a few heights (by a magnet). They come in two sizes only, but maybe you’ll be lucky. You can place on rod or screw to window frame or wall. https://www.ikea.com/ca/en/p/ringblomma-roman-blind-white-30438518/?epik=dj0yJnU9R2NMb1FFYnkxdDZDc2xuQzFRLUlNdk4zektvNFVsLXMmcD0wJm49Vk5qZEdCWnZpa3RaaVlwQXhKWnpVQSZ0PUFBQUFBRl81NGdV

If "relocating the master bathroom to this area" means the full gut that I think it does, window treatments are among the last things that you should be thinking about. First you need a reno plan for the space. This may well mean a substantial change to what windows you have there. In the meantime, hang up some sheers and settle in. Congrats on your new home.