This looks like the room is at least 7 metres long? I am not an expert but have you thought about groupings of couches and chairs? do you entertain a lot or is this simply for a family? I would have a group that fitted around the tv for my family and then add more groupings and tables to take in any view giving it that party room feel. However you need to think about how the room will be used. Latest advice I hear is don't make the tv the hero of the room but we all need to see it too.

Love the colour choices. The matching floor and wall tiles make the room look more spacious. The addition of a beveled mirror adds even more style, your clients must be pleased with the results.

I have not read all of the above. It must be tempting to render and paint the fireplace but if it is decided to work with it then maybe you can find your colour palette in the bricks. The new grey carpet will give you a fresh neutral but grey can be very cold. you might need a bit of warmth in the others colors chosen for walls or soft furnishings. If you extend the tile base in front of the fireplace that will give another opportunity to introduce more impact with the tiles. There are always lots of gorgeous tile options. I am loving some of the Moroccan looking styles.

Are the white bits blinds ? Do they open to the outside world ? Venetians , wooden venetians , curtains , anything would give those a lift ! Probably each one around 60cm wider than the window , with a natural timber valance ( mounted inside the window frame , as opposed to being part of it ) . Lauren Shiels sugggests dark Navy walls , I'd go more a plum burgundy for the walls , although that would depend on your taste , and the other rooms . Striped cushions in the same plum and gold -- warm colours . A tall leafy plant if you keep the couch where it is , or maybe even if you move it or change it .