Like the use of different size color and shape of chairs.
1. Shelf color and rug to go with gray walls and shelving in pictures 2 & 3.
2. Like the back wall. Soothing. Backdrop for great room wall with floating shelves and lower cabinet in pic 1 & 3 to “anchor” tv. Or on far wall on ground level.
3. Like far wall setup for great room. Gray wall behind and rug from pic 1 & 2. Use media console tables / credenza instead of built in for bottom cabinet.
Built in shelves.
Sofa table could be dual use dining table for extra guests.
small windows above doorways from sun room to let in more light.
Table like this would be great for puzzles or to have coffee or read in a small space. With entire top lifting together.