I tried to envision artwork near, under, or around the two smaller windows and it would just make them look awkward in my mind. They are nice as is. I wouldn't want a "face" effect.

Just one larger piece in the big space to the right what i would do.

Too many throw pillows. Just a few that pull color from the art.

You can't beat an ottoman for comfort instead of the coffee table. Maybe something with color.

Some inspro

I wowuld use large format vertical pieces on the flat surface. top of frame even with the top of the windows. a larger piece on the Right and a slimmer one to the left. The windows are merely windows, like anywhere else in the home.

Bottom of the pieces 8" above the back of the sofa

Or

I think something whimsical in the windows might look good. Just an idea -

Not art, IMO, window treatments instead. Run a rod across the two small windows, install as close to the ceiling as possible. Stop the rod at the end of the sectional. The treatment will frame the sectional.

Has to be FL! My parents have the same silly windows. It complicates furniture and art placement, and many times doesn't provide that much light, specially when there is another house 10 ft away.

This is what I did for my parents. I ordered custom sized laser cut panels online and my parents had a handyman install them with thin pieces of wood to act as a frame and anchor them to the opening.

Is it an option to replace or close up those two small windows?

I would do a sort of large piece beside the large window and a nice long horizontal piece under the samll windows and get some color in those spaces maybe the art will help do that .

Good bye wood windows. Hello large piece of art.