Are your sure about your new couch purchase? It seems as if the scale is too large for the space.

Judging from the football artwork and Sports Center pictured I get the impression that a lot of time is spent in this room (especially during football season!) with that said, a comfy sectional sofa is key. On the right track with that!

Here are a few lift top coffee tables and an entertainment center I felt would look nice in your space. I also recommend getting a colorful or printed area rug to bring in some more colors other than brown and beige. Also maybe think about hanging either some artwork or a mirror above the new sofa since that wall looks a little bit lonely.

Not sure what the "fourth wall" of the space looks like from the photos provided but if there is space with the new sofa you can move the piano to be on the opposing wall. Did you want to be able to hide it when it is not in use? how often is it used?

Agree with Monica on the scale of the sofa you purchased. Having a sectional with a chase is configured better for the size of your space and still feels like you a wrap around sectional. Here is one from allmodern.com that looks like a more appropriate scale for your space.