My thought would be to change the blue to a color in the same intensity or go with 2 shades darker than the green and paint the mantle white. Also remove the upper cabinet of wet bar. Put floating shelves instead. You could also go brave and paint brick with milk paint and go with the stain similar to the trim for thee mantle. Buy a much bigger area rug.

Now that we see other parts of the room, solutions come to mind. First, the candle sconces would work better above the cabinet you posted in the other dilemma. The round mirror has dramatic enough texture to stand up to the FP stone, so I'd move it 5" above the mantel.. Biggest issue is the big E-center taking up a huge footprint. I'd sell that on Craig's List and use the money to purchase a low credenza (not a TV stand) and put the TV on it instead of the huge cabinet. The three beams look to be misfits for the style of your space. I'd guess someone just added them and that they are purely decorative, even if real wood. I'd remove them and install crown all around the room. The wide trim on your windows might be a nice feature to expose. When you remove the red drapes, consider inside mounted fabric roman shades. Then if you still feel you need curtains, hang stationary panels floor to ceiling (or to the crown.)

You could also use it for the doggie bed or feeding station since brick is easy to sweep off and won't get damaged if they slobber on it. Of course since I can't tell the relationship of the space to other parts of the room my ideas may be way off base. If the stove was a focal point then they probably won't work.

Even so, you haven't used the room in 20 years. Clearly you don't like the room or the furniture in it. I don't know when you plan to put it on the market, but once you do, you'll want to start packing. Put your packing boxes and any misc. furniture you want that clutters the other rooms into the living room. Save yourself fees for off site storage. The economy is turning and it's becoming a sellers market again. One room that isn't perfectly furnished is not going to turn offers away, in my opinion. Or furnish with furniture you are "guessing" will be perfect in your new home. That seems like a long shot, but maybe that would work in you situation.