Carolyn - All those windows are absolutely gorgeous! I am envious of all the natural sunlight that is shining in. I struggle with the opposite of having darker rooms, ugh.
Those windows that are real close together don't look bad. You could get individual decorative blinds being wide inch wood slats or whatever and add a topper or something to it. It would be a shame to cover them up too much and block all that sunlight.
Your couch looks like it still has plenty of room for some nice art work above, a picture or something.
Those taller windows that go up to your ceiling Id hate to cover them up too much also. It's all just gorgeous!!
Whatever options you choose I am sure it will be lovely. Don't forget to share with us pictures of your finished product. Have fun!!