Combine the t v, the piano, and shelving on one wall.

It appears that you have many small things taking up floor space. I would start by removing all of them. If possible, a large colorful rug could anchor the seating area. Make sure that the front feet of your sofa, loveseat, and chair are on the rug.

Corral all extraneous books, papers, etc. into a nice basket or other such holder. Would the small desk fit against the wall behind the loveseat? I would remove the window toppers, incorporate a few more lamps, and possibly paint the entire room one lighter color. I might even paint the wood above the fireplace that same lighter color.

I'm planning on painting, probably all walls one light color. Not sure what to do with all the wood. My husband doesn't want me to paint over it. If I do restain I'll have to do it throughout the house which is huge.
We like to use the big table for school work, games etc. and need to incorporate that into the room.