Yes, another option is to only use one of my leather chairs and have an "everyday" arrangement and then pull up extra seating when necessary. So, this would seat 4-5. And then I'd pull up the extra rattan chair and the two ottomans to seat 8. Or does it seem unbalanced having the larger leather chair and the smaller rattan chair flanking the fireplace?

I suggest grouping whatever living room furniture you buy around the fireplace. It is what I did in my long living room (mine is wider than yours). Here are some layout suggestions: Before you buy any furniture, make sure you have the room to lay it out something similar to the above suggestions. Put tape on the floor, if you have to and make sure you have enough room to walk around the furniture. You can also try Basset Furniture and/or La-Z-Boy showrooms. They can help you with furniture arrangement and they do not charge you, like a designer does. For the TV, you could either get an entertainment center that will fit right or left of the fireplace or your could even mount your TV on the wall (I have 2 TV's that are wall mounted and I love it). When I was getting ready to move into my house 3 years ago, I needed brand new living room, dining room, and family room furniture. I shopped sales and I found my 2 sofas that are in my living room first at a furniture store selling La-Z-Boy furniture. I got lucky! The sofas were on sale for over 60% off and after choosing them, everything else fell into place. For the family room, I went to a La-Z-Boy showroom, found a reclining sofa I loved, and it was also on sale. I choose soft, neutral colors for it and two rocking recliners. We use this room to relax and watch movies on our big TV in the family room. I also suggest looking at rooms on Houzz and see what appeals to you, in style and color.

@jck910 - Thank you, we really like the sofa and chairs. I'm not sure the sofa would fit well facing the fireplace, as there would not be sufficient space between the sofa and the dining set. There will be no TV in this space - it will be a conversation or curl up with a book area. I will definitely right-size the rug once the furniture is laid in place. @ Stage Right - I will upload other angles when I get home later. Thank you both.

Photos of the intended furnishings and the space are more accurate for assistance. We offer remote services should you need. Best wishes!