Break this down into two steps to make it easier. Tackle function first. Don't worry about a valance until after you live with the shade for a while. Get dressed and go to the stores and play with their displays. Find one that give you privacy, but also works with your fan. The valance is just fluff and you might decide that with your clean lines that you don't want one. The pleated shades that Daisy mentioned sounds just like what you need. Even a nice tailored pulldown sounds great with your Shaker-style furniture.

What is your question I have no idea what this is about. This is a dilemma forum what is yours?

I'm wondering if there's another idea I'm not considering. Are you open to painting the room (including the ceiling) a dramatic, dark color? In my first house, my husband and I painted our vaulted master bedroom a deep cool green (kept the trim white), and we *loved* it. We were pleasantly surprised at how much it darkened the room at night, something we hadn't even considered, but were thrilled with. I also really like curtains, and if it were me, I'd mount a single rod over the tallest window, extending it 8"-12" past each flanking window. Color would depend on the look you were after. Thoughts? :-)

few suggestions for the bay window. individual shades are one option. (woven woods, cellular, roman, solar, etc) Another option is doing a window seat with cushion/pillows and having drapes pull across the whole thing. Or you can do individual shades. BTW, instead of getting a useless blind for the transom window, why not do an insert of some type? stained glass, leaded glass, combo of both,, ,would be pretty. would look something like this (I gave you a blue/green glass beachy design) with woven wood blinds and white drapes. (see below for more info on the window dressing) You can design whatever you like (I have a link to the girl I used on Etsy if you like) I did a stained glass insert over my own window in the bathroom. it's easy. held in place by clear silicone. you have the glass insert made to order to that windows dimesion. Yours would be super easy since it's fixed. Mine opens and closes here are examples to all of those celluar shades w/a window bench curtains w/window bench (BTW, these aren't difficult to DIY) Roman shades woven woods w/drapes for the bay since you mentioned coastal, I really like this room, especially the beaded light. you have the height in your ceiling for something like this. Love the board and batten panels behind the bed too. looks great w/the white textured rug and woven ratten elements. Another way to do the batten panels. this is pretty easy. just run them up the entire wall. paint white and do the other walls in the seafoam (like shown here.) Bring in the beaded light (or a fan) and try a sisal rug. another coastal idea. roman shades on the window Vertical panels behind the bed with a long shelf. put up beachy items to display navy accent wall with white plantation shutters on the bay another bay window (s) with linen style roman shades. love the woven rattan ceiling light, comfy chair by the window, potted plant.