Still think you should center the sectional on its wall. Then you'll have room for some plants in front of the windows where they'll enjoy the light and add life to the beige space.

When you next go to your favorite beach, do some looking at local art galleries for some art for this room. You'll find much in all price ranges.

I thought it was the sliders that were nailed shut and not used. Are you saying it is the swinging door instead?

You've got a beachy color scheme so with art and some decorative items that either are collected by you or someone else from the beach, and I think you're there. I would add yellow and blue accents--sun, sand and water colors. Also some green for trees and beach grass. At this point you've got the colors of the beach on a grey rainy day! The plants look a little harsh with black pots, so I'd look for something softer, maybe woven basket style or softer color, and I'd look for a third one, staggered in sizes. Some plant that evokes the beach for you. In my case, the beaches are northern, so it would be something evergreen or something with broad leaves.

I’d look for ways to brighten up the space. Yes, put the plants in baskets and add a third. Maybe look at your throw pillows - could one or two be replaced with something a bit brighter? Do you have any beach souvenirs? I collect shells and driftwood, and in the spring and summer display a big bowl of it in my sunroom. I also have a large square quilted wall hanging from a trip to Hawaii. I don’t see any lighting - you could do one of those fillable lamps with something light colored.