Since you are building anyhow, and since there is just that little space between the bathroom and the sliding door, I suggest that you have a built-in bench next to the closet, going under the window. Have it either open at the top with a hinged lid, or from the front with a hinged front and you will be able to store shoes and boots out of season, or simply when you come in from outside. If you have it open from the front, you could make it with a shelf, so you can have two levels of shoe/boot storage. If you have it open from the top, you can store anything there, including ski pants and boots, yard toys, or patio supplies. Depending on how the closet is designed, maybe you could have a fold-down tabletop for in front of the windowseat, then a chair, and you and hubby have a little place to sit near the patio door and share coffee and the view.

Right now the only thing that needs to stay is the black mini-grand piano. I am thinking the guitar and music stand should probably stay too since the kids use it to practice. Everything else can stay or go. I am wondering if I should move the grand piano over towards the french doors a bit more and maybe have a couch or something on the wall with the buffet. maybe a basket for the piano books, etc... there is storage in the bench but I think I might need a little more. Not sure if a rug or table is needed. Maybe put the piano more in the corner where the plant is and get two larger chairs (one where the guitar is and another where the foldout chair and music stand are. I also think my husband would like where the keyboard is currently to be clear but don't let that hold you back on ideas. Anyway, any and all thoughts are appreciated ; )

That is some enviable ceiling height! I can’t imagine how much you spent on window treatment. We have 10 pot lights in the room connected to three switches to give it a lot of control how much light and where you want it. There are two pot lights over the fireplace and chairs for reading and then two over each sofa so you never are lacking for light. Most of the time we sat there in winter with the pot lights dimmed and the lamp in the corner on which has a warm glow and the fireplace going. The lighting is perfect for us. The plan is to put a bookcase to the left of the fireplace, a mirror on the other right wall, balance out some more plants and put up some art. If more stuff is collected over the years it will fill it in but we don’t want to go too quick on packing stuff in.

If you're going to be working on the fireplace, I'd mount the TV above it. Many on this forum do not like this, but in some rooms, it's a great solution. If the TV is above the fireplace, then center the sofa in front of the large window, and move one of the chairs to where the TV is now. The large skirted table looks too large for the room. You need a rug to warm up the space, new drapes, the bookcase should go elsewhere. When you replace the couch, get one in a fabric not leather.