TV is too big to be above FP. Move sofa to face FP. Put a chair on each side of FP

Waht kind of style? IMO that whole FP wall is way too busy the TV does not belong above the FP and I have no idea what it is you want from us. I can't enlarge the picture and I need to see the whole room. A to scale floor plan would be good showing all measurements windows doorways where the doorways lead and also if there is another place you could put the TV like another room?

On the whole, it's just too monotone. Everything is gray, black, and white. Get a rug that picks up the gray but still has color in it--maybe blues and greens. Arrange the furniture as suggested above, with the sofa facing the fireplace. De-clutter your shelves a bit and put some colorful decorative objects in along with your photos. Or take the photos and create a gallery wall.

A few ideas:

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So I think this is a rug you are considering? Your pic looks like it may be a mockup, perhaps from the rug site.

Animal type prints are fun, and the rug can work in your space.

I would use a couple of throw pillows on the sofa, to coordinate with the rug and your chairs. I think i would use just two pillows. And if you can move the chairs forward just a bit, to be more included in the conversation area, that would also be good.

These are the two throw pillows I used; you could use these or similar:

If you can relocate some of the items from your shelves, I think it could give you a sleeker look.

And this tv mount would afford you the option of being able to lower, as well as angle, the tv - if that option would be helpful for you. Amazon also carries this particular tv mount/line, as well as others. https://www.mantelmount.com/