This arrangement works much better, but some adjustments are needed to make it work. First, the fireplace grouping needs to be tightened. It crowds the dining area and you need a passageway behind the couch. Turn the rug lengthwise, parallel to the fireplace. Pull the large couch about 2 1/2 feet closer to the fireplace, and place the two chairs and loveseat on the ends of the rug, and pull them closer together. This will give you a more intimate conversation area, and not impose on the other areas of the room. Remove that floor lamp from behind the couch. If you need the light in that area, put it by the fireplace. Also, the stereo system on the mantel needs to find another home. Maybe it can go IN the fireplace instead. At the other end of the room, I think the arrangement would look better if the seating were rotated 90 degrees. Keep the rug and coffee table in its current configuration, place the sofa either facing the window or with its back to the window, and put the two chairs opposite it. Finally, the dining area. Now that you've moved the big leather chairs, you should have enough room. Your rug is too small. It should be big enough to give you at least a 2 ft. border all the way around when the chairs are pushed in. And it's a really beautiful table; please uncover it. I can't see what kind of lighting that area has. It really needs a pendant or chandelier hanging directly over the table.

I know someone who has man-made marble in a bathroom for shower surrounds and vanity tops, and beautiful white window casing and window sills of the same material. It looks great.

I agree with painting the doors. All my interior doors are a deep charcoal grey. You'd be surprised how expensive it makes them look. That aside I would start with a rug. A huge rug. Something chic with a lot of color. Then add love seats in white, colorful pillows, and chairs in fabrics that pickup the colors in your rug. No BIG furniture. Just because you have a big room doesn't mean you need to stick a brown sectional in it. A couple fancy topiary would look great under those windows. And dont forget lighting.

Your idea of breaking the wall directly to terrace is the first step. The opening need a wpc french window type opening with sliding or swing gate.