I'm not sure if you like this idea? If you do, I will try and find cushions and actual curtains. Either rug in pics 1 or 2 with a tan ottoman as a coffee table. I'd have a floor lamp to the right of the sofa with art behind and then a side table (pic 5) with your table lamp. Curtains I'd choose the blue green in pic 4 (same colour as your lovely jars!) and take the curtain rail high. Have you considered panelling behind the fire to make it even more of a feature like the last pic, you could use t&g but shaker panelling etc would work. I'm not sure of your wall colour but I think farrow and ball inchyra blue might work well for the panelling? I'd go for a round mirror, take it as wide as the corbels. I'm really struggling with the tv... if you put a straight cabinet on an angle I think given the size of the tv you're going to create a huge space behind(although my maths could be wrong!!). Maybe try marking it out with tape. Alternatively it's really quite difficult to find nice corner units..maybe shelves could work instead?
Q