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

You could head towards a soft, subtle grey (Rugs USA has lots of indoor/outdoor rugs), but I think it could be fun to add black and white. https://www.amazon.ca/dp/B086DJ9Z3D?ref_=as_li_ss_tl&language=en_US&linkCode=gs2&linkId=e306af400c4bc72a9c878cb81ef845b4&tag=drivenbydec02-20 You could add a beverage cart If it were me, I‘d also add some privacy across the front, which will make it feel cozier as well. Hopefully the cushion storage can be placed on side of house. https://www.ikea.com/us/en/p/tosteroe-storage-box-outdoor-black-30411439/?epik=dj0yJnU9dnZGR29zTFlvRTZpM19pYTdtSXpuZGtScEZIaVd3MVomcD0wJm49MlRsUG05X0NYSGxlWWI3TVRveXZXZyZ0PUFBQUFBR0NmN180

Put your centerpiece on the chess table. Is the other ornate dining set for breakfast, gaming or could it be used here? Do you want to continue with the cow head/skin theme, leaning SW in your decor? They aren't really "cozy and elegant," IMO. Is a new chandy in the picture? That one misses the mark on elegance. You need a minimum of 36-42" from the table top to any baseboards or furniture surrounding the table to allow for chair sit/scoot space. I'd do that measurement first. I really wouldn't want the rug jammed up against the exterior wall. Maybe the smaller, round table would be a better choice for using a rug here.

You could size it so all the legs of the sectional are on the rug. As is the piece looks like it is floating. The rug would ground it. Is it possible to mount the t v on the wall?