I have another option to consider. This is quick sketch so if you like I can do a cleaner version tomorrow This provides clean walkway behind sofa and I put a round ottoman in space across from piano for extra seating. A swivel chair allows for little conversation spot on that end of room. I also put narrow demi line table near sliders so there is a set down space for bringing drinks and grilling items in and out from patio. Sorry it is so dark. I can lighten up tomorrow. Enjoy!

Don't know what the heck those numbers mean on the floor plan. You'll probably have to "float" the seating arrangement in the middle of the room. A couch will be in the middle, with the back of it hugging the straight dash line. To either side of it (allowing of course for room to get around), will be an upholstered chair. Add curtains, side tables, art, rug etc. See if you can get local art. Art is a very personal thing. Take your time and get pieces you love. Carefully consider the amount of space you have to move around. I personally like more space than stuff, but that's me. How many people do you usually have sitting in this room? If you entertain a lot, consider additional seating with poofs and/or mini ottomans that people can sit on. Another option for extra seating is putting slightly upholstered straight back chairs in the corner for company. I'm personally not keen on Bobs furniture - I'm just giving you a general idea. Measure twice, buy once! https://www.mybobs.com/furniture/living-room/chairs/p/20061608001 In my opinion, gray is kind of trendy. You may want to think of a more classic color. Sherwin WIlliams is my fav, but there are a lot of paint companies out there. https://www.sherwin-williams.com/homeowners/color/find-and-explore-colors/paint-colors-by-family#/active/color-wall/section/sherwin-williams-colors Sherwin Williams has brochures in their stores that show how to coordinate everything in a room with a certain color. I worked in customer service for many years. If you get a nt so helpful person - ask for someone else or go to a different store. In my opinion, there's no excuse for bad customer service.

Create a room within a room by separation- using two sofas (or sofa/loveseat/sectional), one facing towards the bay window and one the partial wall. Make the partial wall the accent wall with paint and art. The rectangle in front of it is a Barcelona bench. There is a coffee table for the two sofas. The arrows are the traffic pattern from the front door, enforcing the separation by keeping you from walking right into the seating area. Still not sure about the cubbie on the right, perhaps a reading nook with easy chair, bookcase and floor lamp as a reading lamp. Are you planning on eating in here? Then swag the chandelier closer to the half wall for a smaller dining area. Otherwise no chandelier. This is only a concept rendering and not to scale. You will have to determine the exact placements:

You'll get better responses if you post a measured 2D diagram.