Oh! And should I paint an accent wall?

If you mount the TV you might have room enough to shift the chaise lounge to that wall. It would be placed at an angle below the TV. Then pull the sectional out about 3" from the walls. The end seat would now be an armless section. You could put a small table there. I'd accent the TV wall with a color but keep the color soft like a Medium Blue. Add a throw in the same color. Just toss the throw over one arm. The tables don't help because they are heavy blocks. Lighten up the coffee table by adding a low bowl in an interesting shape. Fill it with beautiful hard candy or colorful marbles.