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.

It is three feet off the floor. Here's another pic showing where it sits relative to the stairs. None of our rooms are fully decorated yet. That door is the bonus room which is like a college and sport theme and the master bath is at the top of the stairs which has a country house sort of theme. The other walls of the upper floor have pictures of other vacations. The nook is pretty isolated from everything though.

A few weeks ago I posted about my great room with the double sided fireplace in the middle of the room. You guys said I needed a room to scale model of the room so here it is https://www.dropbox.com/s/wt3rycma5eerplb/Living Room-1.skp?dl=0. I will be getting new paint, furniture and decor. The only pieces I would like to keep are the piano and maybe the liquor cabinet. Also note on the left wall there is a wall vent which has always made it akward to work around. Any advice who be great.

It depends on what you are going for. Want something homey, add large pictures of your family. this way it doesn't clutter the visual space as its the width of a hallway. Want something more modern: try peel and stick wallpaper. it doesn't have to be crazy bold, it can be textural to warm it up and give it a little something with it being a large statement. Personally, I would not add mirror as it would be reflecting a wall.