In one sense, this is like dealing with a large garden. It is hard to make "rooms" when there are no walls to deal with. However, just like in a garden, the more "rooms" you make, the bigger and better the area looks. A little nook by the fireplace, with a sofa, a table, and some chairs facing the fireplace, would be a great little area ("room") for reading a book, relaxing, and having a glass of something. You may even need to have three "rooms". One for the fireplace, one in the main area for entertaining, and a third by the end. A piano is helpful, as mentioned, for the third area. Define areas (or "rooms") using carpets, the direction the furniture faces, etc. In terms of furniture - your area looks a little bare because there are few side tables, lamps, etc. Some dried flowers or something of that nature on top of your table would help create a center. Bring a side table between the two yellow chairs and put something like a lamp on it (yes, the cord is annoying, but you can hide it under the carpet). For the sake of conversation, make sure both yellow chairs face inward, toward the table. I would personally make the north wall into your TV area, instead of having the TV equipment on your west wall in your entertaining area. A nice bar would be great on the west wall for entertaining guests, and perhaps a mirror to reflect the light of the windows. If you keep the TV armoir closed, it would make a nice piece between the north windows, and would balance the fireplace. Then you can just put a couch facing it, a coffee table, a couple of comfy chairs, and some side tables. I realize that I am suggesting a lot more furniture than you currently have, but it is probably cheaper than buying a piano. If you do decide to buy this furniture, I have a tip. What seems to be lacking is one overarching and cohesive style. You do have a lot of dark wood and beautiful pieces, which is a good start; so perhaps you could either pick a couple of central colors (like mustard and emerald) from what you already own or a certain period of furniture (harder, and more expensive) and make your future purchases based on that. Don't neglect craiglist, antique stores (even beyond your immediate area), friends, even freecycle. Always ask - you never know who your friends know. I would also venture to say - and I do hope this does not sound critical - that your sofa doesn't seem to match other parts of your room. This may just be the way the colors look online. However, if you would like to do something about it, you don't have to replace it - they have very nice covers now that you can simply slip on to change the whole appearance of the coach. Again, it seems like your main colors are mustard and emerald, and you could put around some white throws or pillows to help tie in the curtains. That last bit on color relates mostly to personal style. Overall, I think what would be the most useful to you is to have three sofas, 3 coffee tables, around 6 chairs, and around 3 side tables.

Ok, in my opinion, I would not put the tv on the the wall to the left due to the window reflecting onto it, unless you want to use blackout window coverings which you would have to keep them closed most of the time:/ Instead, I would replace and lower that mantle with an appropriate sized beam for an updated look and then you would also be able to to lower your tv a bit, then add some floating shelves on either side of the fireplace that would also tie into the beam mantle. I would need to see more pictures of the whole room to help with more ideas. Hope this was helpful even though I’m a couple years late on this post, 🤪

I won't add anything else to the walls as they are already occupied. But you use peel and stick wallpaper to add depth and pattern. Easy to install and remove. There are hundreds of patterns but a few examples below.

Yes, arrangement looks much better!! If you are anxious to paint, you could roll out the Natural Wicker, as you are going to need a primer anyway over that deep paint. Won't hurt to use is as basically a primer. I can't really recommend a paint until you are finished with the room. Your next step will be chairs, lamps, end tables, lamps (I would get a nesting coffee table or oval), art and drapes (which are too short).