We are not window treatment people either, but have started to add some as we've reno'd/decorated a few of the rooms in our house; two bathrooms and our office. They really do help to finish off a room. That said, we're not covering our kitchen bow window, or the DR bow window, though I might consider something for the DR window at some point--just for the window panes themselves, not to cover the whole bow-unit. We used Hunter Douglas' Designer Screen Shades in the Roman Shade style (ours are mounted inside the frames becuase of our window style/frame depth). The shades are very clean-lined and range in sheerness. With the sheerer weaves/fabrics, you can see outside with them down and they allow a lot of light in.

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.

@Melndo The walls are Benjamin Moore Rockport Gray: https://www.benjaminmoore.com/en-us/color-overview/find-your-color/color/HC-105/rockport-gray?color=HC-105 Our window is north facing as well. There is a large Japanese maple near the window so we don't get a ton of light there. I have the floor lamps, two table lamps and a light on the ceiling that isn't in the picture to make sure the room gets enough light. We actually use this room as a music room. There is a piano on the wall that isn't in the picture. Hope this helps! Glad you like it. :)

Since you have the cranks on the windows and need access to them, I wouldn't put anything there. Valances can be old fashioned and your windows are more contemporary. If I didn't need privacy, I would forego window treatments. The views are nice, but if you don't want to see the deck and its furnishings, try an inside mounted semi-sheer cafe curtain on the tall window. That still allows a view of the trees, but will block the deck and railings from sight. Add color to the kitchen with some colorful hand towels, pot holders, crocks/cookie jars/canisters, a kettle or small appliance. If you limit the items to a few decorative accessories, you can change them out when you feel the mood or the seasons change. Pops of orange A bit of lemon Turquoise