On that section of wall I personally would center it in the wall space. One large piece centered or a triptych 3 piece with center piece center of the wall.

I love these sunflowers, so vibrant and colorful and beautiful.

https://www.etsy.com/listing/204228385/sunflowers-triptych-metal-wall-art-ready?ref=market

Not to be contrary ;-0 but I would center a large piece over the sectional and fill in with a table lamp on the end table, not more wall art. The remaining wall is fine blank. I would have a piece (or something like a diptych or triptych) that at fills in a great portion of the area above the couch.

What Oly said....

Can we get a shot from farther away? My first instinct was to center on the wall. Of course, my first instinct was also to get artwork that is 6 feet wide and 4 feet high, which might not be what you had in mind (or can afford).

cawaps - I will take another picture in morning and post.