You have a nice room, just needs a bit of tweaking perhaps. I think the basic arrangement has to stay, as you are limited by the large entertainment center and window. But that is okay! I would like to see the beige chair and ottoman used together. Right now, it feels to me as if the ottoman has been pushed out of the way for some reason, and is waiting to go back to its home. I would leave the beige chair where it is, and put the ottoman in front of it. I don't think you need a coffeetable. With tables on either end of the couch, there really is no need for one. That will allow the ottoman from the beige chair to sit into the middle of the room a bit without creating traffic issues. What I would like to see is the rug pulled under the front legs of the couch, rather than sitting as an island in the middle of the furniture creating another visual box smack in the middle of the room. I would like to see taller lamps on the end tables, to help make the couch area seem taller and balance the height of the entertaiment center wal and the window wall. I think you need a lower, larger table round accent table between the two leather chairs, instead of the plant stand that is there. Then add a great lamp, perhaps a clear glass one to feel lighter in front of the windows. The torchiere seems to serve no real purpose stuck in the corner. I would move it over to the side of the beige chair , near the ent entertainment center. I am not sure I would choose a gold/beige for that space. You already have lots of gold and beige tones in all the furniture (except the couch) and in the wood floor. I would look for a great green, something related to the rug, which will set off the furniture and make the room more interesting. Add some colorful pillows, and some additonal art for the walls, and you are set. I would also consider adding some drapery panels on either end of the window to soften the hard edges of the verticals, and to bring some color to that end of the room. The entertainment center might be another issue as far as what is on the shelves, but we can't tell from this photo. It does kind of appear that there are lots of little frames on it, which aren't always the best way to go. But we would need to see a head-on shot for determining that.

From your description, a full three feet in front of the box bay will be required for your traffic pattern. That means the bay should not be considered a part of the living room and subtracts 3' from its length. The size of your bay will totally determine what can go there. You might do a window seat or just a collection of plants if it's small. It would have to pretty deep to hold chairs and a table. Any more suggestions and sizes will require photos and dimensions.

I agree with the others to place TV and attractive wide credenza on the large wall with a great sofa table in the back of floating sofa. Do you need to replace sofa or rug? If not, then a sofa table behind it, with new sofa pillows and two great arm chairs in cream and facing the sofa, and new round coffee table up on legs would give you flexibility for the future. A sectional can be very limiting without adding much seating. You do already have a chaise on current sofa. Etsy offers some great, affordable wood sofa tabletops in any length and height. Just use their search box--"console tables, hairpin legs"

Turn your sofa to face the TV/fireplace. You may not have any space between the wall and arm of your sofa. Maybe get a narrow table for behind the sofa for lamps. If you get a new sofa, don't do crazy oversized -- 84" is plenty long (I bought a 3-seater that's less than 72"!). Place your loveseat where they had theirs, next to the sliding doors. You now have L-seating great for conversations, and TV. I would suggest a sofa or loveseat with 2 chairs or one larger chair & ottoman if you purchase new instead of a sofa AND loveseat. And don't buy a sectional! If you could get dimensions of the space and your furniture, and photos of your furniture, that would be helpful. Their set-up looked great, though I don't understand the sofa placement unless sizing was an issue.