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 . . .

Before you can decide on seating you need to design based on a balance of what you need every day, what you need when you have guests, how often you need the additional seating and the activities that will be done when you need the additional seating. Example: Typically I have 2 people watching TV or playing board games in the evening. About once every two weeks I have 4 people. A 5 person sectional with an additional chair works for both board games or TV. About once every 2 months I will host dinner for my siblings and spouses - then I have 10 people, but the girls usually hang in the kitchen, dining room and the guys go watch TV. Still works. About once a year I have the whole family over for some kind of function. That will be 30 people. I didn't plan my seating for 30. I have a couple of rooms that have seating and we end up a bit scattered. I have enough seating if people use the livingroom, dining room, sitting room and I pull extra chairs that I have in the bedrooms and store in the basement. We just kind of muddle through. In the two years that I have lived here I have not once needed more than 6 seats for watching a movie. My sister entertains a lot and has a large number of guests at one time on a regular basis. She has a great room with a dining table that seats 12, bench seating under her window wall that butts against her corner fireplace, a 4 person couch with a chaise plus 3 recliners and another small bench that she will place in front of the fireplace and an ottoman that can go in front of the TV for addional seating. She also has several shallow boxes that fit over her TV so that it looks like wall art instead of a TV. Knowling your needs really helps define the amount and type of seating you need.

If it were me, I would paint the wood white and remove all of the items on top, so as to have a less cluttered space. I think a mirror, along with the prints on the wall nearby will feel too busy. Maybe add photos and a potted orchid on mantle, which will compliment the nearby prints and create a cute little corner. Play around with size, height and quantity and look at lots of pictures on Houzz and Pinterest to get ideas. Have fun! Just another idea would be to centre the prints over the tv, lower a bit and place side by side for a more modern and balanced look

I love having a corner fp. We always have a fire going during cold weather, and it’s nice having it next to the TV wall. Two focal points we can be facing. Makes for a very cozy seating area. :) Anyway, do you use those two accent chairs? If not, I’d relocate or sell them and get a longer TV console. Maybe something vintage? I’d center it/TV on the wall and hang art, put the plant on the right, etc. Then you could move the whole seating area towards the fireplace more. That’s how I have mine. Empty space between the TV console (a big old Jacobean sideboard) and fp, and art all around the telly.