I did art around mine ... our TV is on a vintage buffet. In fact, my wall and ceiling height are very similar to yours. A few examples of countless arrangements you could do. It might help to cut pieces of paper or cardboard out and tape them to the wall to see what sizes/arrangements you like. Also — lots of ideas on the web, searching ‘art around TV’, etc.

I have been struggling with what to put on this wall above the couch for years. I previously had a set of 3 abstract water color pictures. What’s your thoughts on this pairing? Link suggestions. Would prefer to keep things neutral so I can change out the pillow colors in the future. Thought about a mirror but everything is so heavy.

Look for a nice piece of artwork that you will love to fill the wall space there. Also, consider a potted tall plant to place in the corner by the sliding door.

I try to avoid art under glass as the sun or lamps make it hard to see. I would suggest you get a nice outdoor scene work of art from online or a studio. There are lots of sites that sell online. I'd get something that shows colors and meaning but you have your own choices.