Unless the room behind the pass through openings is dark, and it doesn't appear to be, the best thing you could do for this room would be to close both of them. This would also enhance the other room because you could add storage, cabinetry, etc on those newly acquired walls. As for esthetics, the pictures floating away to the ceiling are grabbing all of our attention - negative attention! Pictures above furniture should form a visual unit with the furniture (5" above the couch, for example) and pictures hanging on open walls should have their center point (or the center point of a grouping) at 5' above the floor. Nothing should hang above window or door frame level. Your TV needs a credenza (not a TV stand) that is 25% wider than the TV and it needs to go on the wall where you have all the little floating pictures. The console should go on the pony wall and the two chairs should angle with a round table between them in front of the window. Take everything off the walls, try this arrangement of furniture, photo is and post here for further assistance.