I would take down that chunk of crown moulding, which makes no sense whatsoever and crowds anything you put up there. I fear that you also don't have any natural boundaries for painting a section of the wall a contrasting color, so I'm not sure that's a good approach. If you can find reasonable boundaries, I might take a middle gray from the stone.

If you must put the TV way up there, at least center it over the larger opening, so it doesn't look so looming. Any chance of getting the components off to one side, so the TV can stand right on the ledge? Then put a nice piece of art up on the other side, and take all the clutter off the mantel.

Paint the molding a charcoal Gray, at the ceiling height...paint the mantle the same color and paint the woodbox, where you have 3 figurines, the same color charcoal gray--or a matte black color in those 3 areas? I don't know what it would look like but you could just paint the woodbox, the mantle, the wall above the mantle and the trim, all the same color...either a black or a charcoal gray(matching the stone's darkest color) OR! Keep with the trim and the woodbox color and paint it all a pretty gray white(not the stone). It might be better to do the wall the same color as the mantle, trim and woodbox? White is certainly more family friendly, than maybe the fireplace screen could be a stainless steel? or silvery color? I guess if you use it, it becomes black with the smoke in the firebox? You do have a challenge on your hands. It would be easier if the television was not competing with the fireplace area, to be sure.

I was trying to visualize balancing the black of the tv with the darkness of the fire screen....and wasn't sure what to do with it, other than make it all dark? But than I thought that is just not very friendly in a family home vs a theatre room upstairs for football game viewing. Your decorations are cute. I figured you were just happy to have a place to put them while you studied a more permanent set up. Let's see what ideas other's come up with.

Just enjoy moving in and the change of seasons. It may take your family some time to figure out how you come to 'live in' your new space. And there will be more comments coming your way with suggestions. Don't do anything to permanent till you have a lot of good ideas come your way to consider, that work for your home. I can feel the happiness in your decorations put up over the weekend? likely? Decorate away. It makes great memories! :)

There you go. Grover knows. That makes such a difference! The trim is gone over the 'firewall'. That does make a difference. But he stashed your accompaning electronics around a place off the mantel. I have seen that done before too..

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I would buy "pretty" firewood and stack it in the opening.

This fireplace reminded me of yours! https://www.pinterest.com/pin/101542166585218741/

This fireplace reminded me of yours! https://www.instagram.com/p/BcJTL88HlBL/