That last pic is lovely but you do notice there are no wood blinds which IMO are not a good choice in a bedroomthey seem to never really go with the bedding, which BTW we nned to see.

We had window film installed in the bathroom in our home that is visible from a neighbor. We are lucky to only have three windows that have a direct shot from our private shared road. Thy did a darker tint on the lower half and a lighter above. Mostly you can’t see anything unless we are standing at the vanity. And that is blurred neck up. It is a 3/4 bath and is primarily used by visitors. It has helped with intense afternoon sun. Our house was “placed” over 100 years agi and they didn’t take sun into account. The other three sides we are lucky to have tree coverage or no one in our sight line. Enjoy that beautiful bath!

I would put a simple window film on the arched window. It will give you enough privacy, light coming through, and cover the bad view. You can use a slightly frosted one, or maybe one that looks like seeded glass to match the style of your home. There are los of options. For the square window, you can use a woven wood shade or other blind. For interior mount, you need to measure using the larger outside frame and look for one that will work with the narrow dimension for installation. I think it would be best to mount a roman shade over the window at the ceiling. Then you get the most light while the shade is up and don't have to drill into the beautiful wood frame. You could also mount a rod above the window and use a simple linen drape on each side to pull closed when you want privacy.

@Ely M Beautiful inside too! Gorgeous floors. Love those windows & would be a shame to hide any of the features of them on inside. I’m guessing windows are centered on the wall - looks off in picture but guessing that’s angle. I’ve never seen angled rods as @threers suggests. I also think any inside mount blinds would be custom & $$$$ due to shape & I don’t think outside mount fits these windows. I would go with drapes with the rod just above highest point on center window & with panels that split in middle & pull half to each side. I see the vent at lower right so you may need to use shorter length that ends just below sill. Even though the other window just like this one is evidently in another room, if you want to cover it at night, use same kind of drapes so the view is the same from street & the back side of drapes should be white. BTW, love the hanging light too!