The table and chair placement looks a bit awkward. I would be tempted to swap it's position with the couch and have it closer to the kitchen. But if you like it there for the view I would move it further into that corner and get it closer to the window (maybe remove the cabinet?).

Then you might have some space to play around with the layout of the couches. They feel far away and separate from the TV/Fireplace zone. I would move them in closer. Don't be afraid to move the couch away from the wall. Maybe just move that same L-shaped configuration closer to the fireplace and towards the windows?

Definitely add in a big coffee table (or one of those big ottomans). Square would work since your couches are the same length.

You could also have the two sofas face each other and add in some chairs. Some ideas for layout: http://www.houzz.com/two-sofas