I'm guessing your style is casual. See these ideas: https://www.houzz.com/photos/query/casual-family-room/nqrwns Note what you like and don't like. Put the ceiling lights on dimmers. Put a table lamp or wall sconce in each corner at chest height. If you have any plans to paint the walls, you may want to look into a gray blue or a gray green. You have a lot of color in the art over the fireplace, but that's the only place I see color. You may want to consider putting a lot more color into this room, perhaps in a lot more wall art, pillows, throws, rugs, accessories, and lamp bases. I would put curtains up on the bay window to make it cozy (in the same color as the walls).

1) Console under the TV, at least 30% bigger than the TV.

2) echo the colors from your painting elsewhere in the room -- maybe recover some of the white striped pillows, etc. A rug with some color or pattern might do better than the plain tan too.

3) small art over the armchair to right of couch

I would start by pulling the chair out of the corner a bit and also pull the sofa forward, out of the bay area. As it is now, all the furniture looks smooshed against the walls. Just a few inches off the perimeter wolid make a big difference.

YOu need a caibinet under the TV and the TV needs to be lowered so that the center of the screen is at eye level when you are seated. , so a low cabinet and as mentioned wider than the TV . Then add color with a rug or pillows .