You don't have to cover all 20'. Focus on something over the sofa. One piece, 2-4 pieces in a grouping or a gallery wall. The open end needs a more substantial end table with a lamp and maybe a plant next to it.

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This is from icanvas.com. I’ve also added a faux tree to hide the electrical outlet.

As said above - don’t judge the wall as the whole 20’. Decorate the wall using the sofa as your base.

Thank you all! With sofa being off center thoughts on whether to center artwork on sofa or the wall? Also thoughts on single piece or grouping?

I would do 1 large piece of art (at lest 3/4 the width of the sofa) centered on the sofa. Is the sofa on the window wall centered on the windows? I would move the tall chairs to the open end of the room. Mirrors over the cabinets. Lower the art over the FP. I don't think the pillows on the sofa do anything for the sofa/room.

Center artwork on the sofa, not the wall. Forget about how long the whole wall is. (I must have not been clear in my post above.)

If you have a larger piece of art over the fireplace, then I would do a gallery wall over the sofa. Or a complimentary sculpture or group of sculptures, for example, metal, wood or woven. Or one or more mirrors.

Two big art focal points doesn’t work well IMO. It needs to be changed up. Alternatively you could hang a big painting over the sofa and put different types of art over the fireplace.

Our living rooms are similar. The large wall behind the sofa faces a large window. With that said, no glass or anything that will show glare or reflect the outdoors. Ours still remains blank because of that issue, we haven’t found the perfect picture or wall hanging to suit our style. Good Luck, I’m looking forward to seeing what you decide.

Your seating needs pillows in a color other than beige, and ones that don't look like they were made of wood. Get some down filled pillows in colors you have already established in the room.

Why not use a large mirror to reflect the window view across from the sofa if it's a nice one?