This is gorgeous, 2.625 yd Brunschwig Fils Upholstery Fabric Monsoon Floral Coral and I think it would work beautifully, but note the odd sizes of the pieces if you are interested. Brunschwig fabric is very expensive, and this is a 'relative bargain' on eBay.

Definitely need a light rug to add some contrast, perhaps ivory? I would accent whatever color you chose with some decorative throw pillows. Have you thought of putting anything on the wall behind the couch? www.homesweethomestore.com

this room is almost identical. I love it w/yours too. that accent wall really sets off the stone in the fireplace. I'd try it on that large wall, OR, just paint the sides of the fireplace. it will make your artwork pop too any of these blue grays should work. It will also give some contrast and make that lighter rug show better. try turning your rug the other way. maybe bring in a few wood items to warm up all the cool gray You see how they have a chair placed in that pic near the fireplace? I'd also do something like that with yours. get something in a walnut wood w/contrasting color. These are all from Article. I actually did this walnut in a Mist color in my room https://www.article.com/product/12914/otio-mist-gray-walnut-lounge-chair

my daughter has similar chair and grey sectional...she has windows just like yours! She did a navy and white wide horizontal stripe. She got them on sale at Target I think, 5 panels and they are the shorter length and she hung them on a one inch diameter rod and they stop right at the bottom of the window, the rod is between the ceiling and the window top and are about 5 inches beyond the windows on each end...they look so cool and since they are not hitting the floor they hang nice and straight.......the sofa is in front of the window too,