Hi. As far as placing your existing furniture is concerned, I would swivel the dark sofa (the one with its back to the leather sofa) around so that the two dark ones face each other. I think you need to do a bit of shopping -- an L-shaped console/table would be ideal on the right to balance the room out, with the TV placed directly on it, and perhaps your big floor vase on it in the corner. You might get the same effect with two consoles if you can't get an L-shape. Add a coffee table between the dark sofas, and a great big container plant to separate the two areas.

I'd prefer art to replace the mirror, but in either event centre it over the sofa.