We all have different tastes. I've "decorated" 3 homes in past 10 years, all drastically different due to where they were located (suburbs, beach, mountains). And I'm constantly tinkering. So filter any comments through your own lens.
I agree with others that TV is a bit large for room. But, I think you can downplay that by having floor-to-ceiling bookshelves built in on either side using same finishing as fireplace, windows and doors. Will make it look purposeful. Also, books, games, pictures and other decor on shelves can add color and warmth.
Tray on ottoman/coffee table could be quite a bit larger and either white wood, cream or a pale gray weathered wood. A pop of color, which could be changed out seasonally, would direct the eye -maybe the pillows and a few candles on the tray.
If you frequently use the throw on the sofa, I'd put it across the back or over one arm diagonally rather than so squared off. Or, get a straw or fabric bin, roll that throw and a couple of others and put in bin. Will give a softness to balance all the black leather.
It's your room....enjoy it!