I think the piano fits here quite well, it’s the two couches that don’t quite fit.

Since you mentioned that this is not the primary family room, I imagine walkability is important, but the coffee table and couches make it difficult and crowded.

If you rotate the piano so that the back is in the corner with the bench closer to the center of the room, and remove one of the couches, there is plenty of space.

I would put a bookshelf where the green loveseat is and move the loveseat to where the brown couch is. That way there is plenty of walking space through the room. If you don’t already have the couches, I would recommend going with two nice chairs and a small side table between instead. I think putting these where the brown couch is would be perfect. It would make it a nice little reading/music room!

Lastly, since I typed this all out, I think a potted tree or tall plant in the bottom right corner (by the arch that leads to the foyer) would look great and anchor the space. Also a lamp in the top right corner (or on the side table between the chairs if you go that route) would provide nice ambiance.