This is a close up of a tweedy type rug that might work for you - I just think a darker rug will cozy up the area and complement the ottoman so much better.... This rug has been discontinued and the remaining sizes are probably too big for your space, but it might be a direction to be looking, if it appeals to you: Something like this might work, too. I can't tell for sure about the colors but Pottery Barn has samples available in store if there is one near you, refundable deposit when returned:

can you post a pic from the other direction? (stand next to fireplace) can the round dining table be placed closest to the kitchen? maybe off to the right in the foreground of your first picture as shown in your floor plan? are you putting a tv in there? where is the cable outlet? this layout is rather long and narrow. media cabinet lay out do you have an area rug? I like something like this to the left of the fireplace under the window or behind the sofa along one of the walls something like this would look cool. easy to hack w/Ikea Billy Bookcases.

Can you return it and get a smaller one? (I admit I think your fireplace wall is lovely and I personally wouldn't ruin it with a television. But I am a tiny minority who has lived without television for almost 30 years.) Is there another room in which to put it, or do you prefer to use this room for watching it?

Are those beams (or the trim that appears to be affixed to the undersides) hollow? If so, you could run wires through them for recessed lights.