I have a similar angled fireplace. If you're not wedded to the TV over the fireplace, I would suggest putting it next to the fireplace and angling your furniture around the TV. That's the way mine is. You can see the TV face on from some pieces of furniture, and the fireplace face on from others, but all can see the TV and fireplace. I use my fireplace daily in the winter so don't want a TV over it, it gets too hot up there. I would advice against a sectional. You can get the utility of a sectional from a couch and a lounge chair or two. I'd be more apt to angle the couch where the chairs are in your picture. A floor drawing would probably help with furniture placement. I think you could totally redo the room to match your inspiration picture, keeping the wall color unless you really want a dramatic change. I love the curtains in the inspiration photo! Your house is open concept like mine. Hard to figure out whether to repaint or not, because once you start with one room, it snowballs to how that affects the other rooms. You could always do one wall another color like the current owners have in the photo. Wish I knew what that color was in your inspiration photo. Browns and tans are the worst for me as far as choosing the right one. I burned up a lot of cash in sample paints when I moved into my new house. But it is the right time to repaint, before you move all the furniture in . . .

Sounds like you and hubby aren’t on the same page. Buying a table, without ability to return is red flag to me. He bought that rug too without your involvement. The rug is wrong size and style. No photo of the table. But better sit down and talk about this and reach some compromises otherwise, these situations can fester and get ugly over time.

I see a few things that aren’t horrible, by any means, but could be changed. Mirror and sideboard, for instance, as mirror is too large for the sideboard and it overwhelms the room, reflecting the t v. Try the art over the sideboard and add a floor lamp where the plant is, as it will do double duty for the sofa and the art. Have you ever thought about adding a floor to ceiling strip of trim to separate the dining area from the living area and painting that wall a color? Something like this with a couple of white shelves on that wall?

take the lamp with the yellow shade and set it on your end table. It will give you a feel for size. Im not sure you can go much larger on the end tables might start to get stuffy. Also, do you have floor out lets? IMO, not at pro. But I think that whole back wall could be better sorted. maybe a sofa table behind the could be a better place for lamps? OR maybe a long narrow console table on the back wall. move your art around and put lamps there?