A photo facing the fireplace (standing as far back from the fireplace as your can), a photo sitting on the couch, and a photo standing with your back against the fireplace would be very helpful.

Check out this ideabook about selecting end tables and the right height - it shows answers for both sofas and chairs https://www.houzz.com/magazine/how-to-pick-the-right-end-tables-for-your-sofa-stsetivw-vs~6695727

Have you thought about switching rooms? If dining table and piano were in LR, it looks like sofa and two chairs could possibly fit in dining room with room for armoire/tv where China cabinet is now.

I think I would have preferred art on that mirror wall too. Or does it reflect some light from windows on TV wall? What would be the purpose of the bench under the mirror. It seems that space behind sofa is a walk-way so I'd be careful not crowding the area with benches or sofa table. Is there room on wall side of sofa for a table? Or would something like a drink table or C-table be a better fit (does the sofa have a chaise end or is that a separate ottoman?)? I like your prints/frames- maybe just a tad high- I think midpoint should be 60" from ground. Is there a color from the prints that you can pull out as an accessory color? I would add that color in a tray or something on the coffee table to help blend the colors better (don't think the whitewash looks cohesive with the sofa and brick wall)