I'd leave them without curtains. Doesn't look like you get a lot of direct sunlight and since it's a living area, privacy is not as much of a concern.

Thank you

Even if those windows don't face south, if they aren't UV coated, I would apply a film to them to block UV. Otherwise the light will fade your upholstery and rug. I don't think the windows need curtains, but if you need to block light at certain times of the day I would install roman shades or cellular shades. If you get a sheer cellular they still let a lot of light through. They're usually available in various levels of sheerness.

Are you saying to leave the top portion alone and add some along the bottom windows only. Privacy is not a concern for me. None of us walk around the house nude. If someone was near the window, they could see that room and the stairs only.

If you don't need privacy I would leave them as they are. I miss read and thought you needed some privacy.