Yes, that was what I meant, although cliff and joann's idea is equally good, assuming the couch will fit into the bay window. I think the largest piece of furniture always looks best when it's facing the TV, so either way would work. However, having the door that close to the couch may not be a good look. I would get another chair or love seat to complete the seating area and a smaller coffee table with a glass top and metal legs to maximize the spaciousness of the room. Of course you'll also need smaller tables with lamps by some of the seating to complete the look. Do you have wall to wall carpeting? If not, then a beautiful area rug would give a lot of color and interest to this room.

You appear to have baseboard heat/ac beneath those windows. That's something that would need to be addressed if you build in a window seat and/or taken into account if you place your sofa in that window bay. One drawback to having a sofa floating in the middle of the room (as shown in your pic) is that there are no end tables with lamps (hidden cord issues) for either end of your sofa ... unless you're setting one end table between the sofa and the wall that separates the living room and kitchen. Your walk-thru path would then be between the sofa and the large window/window/seat. If you prefer the back of your sofa against the wall (with end tables on each end), another option might be to move the doorway between the living room and dining room closer to the fireplace and face your sofa toward and centered with the large window with a couple of swivel rockers and table between them in that window bay.

I would take some painters tape and square off the room. The bay window side and the alcove side and use the square area for furniture placement. I would hold off on buying a sectional until you are absolutely certain it will work. Most often a sofa and chairs is a better purchase

Here is how I would arrange it. Not having dimension, this is obviously not to scale, but gives you general idea. I'd use round features when possible to eliminate the look of the angled wall. Example: here I used a round rug and chairs. I don't know how much space is in the bay window area or if you need to place a dining table there. But, if so, this is one option of how to fit a dining table in smaller space: scoot it up to the back of the sofa. I also do not have information on what furniture you have, but I would not use 2 sofas as the current owner is showing. I'd use one sofa and a couple of chairs, as show below. Hope that helps. Let me know if I can help further.