Nice room! I'd leave the walls on either side of the window empty; every space needs room to breathe. And it may just be me but I'd avoid any art that is made to "match". On the wall above the couch, a large horizontal piece of art you love would work, Or try a long narrow picture ledge with a nicely curated collection of your favorite photos and art. There are lots of inspiration photos of finished picture ledges here on HOUZZ. Love your choices so far. Good luck!

Art is very personal but here are some visuals

Art, not shelves, above the couch, and nothing beside the window. I'd start hitting the galleries and local art shows for inspiration.

Please add lamps, floor and/or table lamps too.

Thank you! This is very helpful!

in addition to all ideas I would get a coffee table plus fuller curtains.