There are a couple of things going on here that seem uncomfortable. The wall shade is pretty but lacks warmth. SInce you have such high ceilings, I would go for a medium gray color on the walls to warm it up. Pull the sectional away from the wall . Purchase a very large rug that will go beneath all of it to bring it together. I would suggest a sisal or jute rug in a thick weave, perhaps with a pattern (ie black and beige herringbone). Recover the green chair in a deep gray and beige pattern. Ditch the pillows you have or recover them and add to them. Use charcoal, black, tan, maybe some ethnic looking patterns such as kilims, etc. Make it more lush. Over the fireplace, add framing to extent the mantle upward and paint it the same color as the fireplace surround. Bring the furniture so it more closely groups around the fireplace and put the rectangular table behind the larger portion of the sofa. Add lower hammered silver lamps with black shades behind it. On the fireplace mantle, choose some inexpensive silvered accessories that will shine and repeat the hammered silver in the lamps. Target has some mercury glass things right now -vases, ginger jars, candle holders. Cluster these for some unity and glimmer on the mantle. On the table you put behind the sofa, add another grouping of gray, black and neutral items (a bar tray with glasses, a bowl of silvered pinecones, etc). Bring more natural elements together and group them. If you cannot afford real art for some of these large walls, group black framed photos or neutral toned flat baskets. With a neutral pallet like this, you will easily be able to add festive seasonal touches, unique monogrammed or embroidered pillows, interesting art.

The attached photos have some good ideas for your living room. It looks as though you like blue, so consider a dark-bluish gray for the walls which will warm the room. Add a pop of your favorite color in pillows and accessories. Take the shades off the windows and add draperies. Maybe retile the fireplace with with glass tiles.

Don't think attached pictures come through. Search on Houzz.com - "Gray with Neutrals" to get some ideas. Good luck!

I feel like there needs to be an upward extension of some sort over the mantle to balance it on the wall.
I have seen that done in newer homes with varying materials such as wood or stone/brick. From what I can see the furniture isn't facing the fireplace which to me should be a focal point, and I would arrange that sectional more facing the fireplace. For colors, you could do a variety/depending on what you like. Someone said a medium grey, which would be more dramatic than a lighter beige or gray. Seems like grey would match better with those surround tiles. I think paint, a change in the fireplace's vertical height and a new area rug or two would be all that is needed to make a big impact, then later add in changes to artwork, etc.

I would definitely recommend a grouping of art for this wall. If you have something specific in mind we would be glad to locate it for you. A nice thing that you will notice on our site is that every image comes in a standard set of sizes making it super easy to build groupings. Hope you find something you like and as mentioned if you have something in mind just let us know and we be happy to search it for you. Enjoy!

http://www.committedphotography.ca/

I agree - the fireplace seems lost on the wall. You need some trim above to balance it out and give it some heft. Imagine the trim going all the way to the ceiling. It could be just a flat panel with some picture molding on the inside and some flat stock molding on the edges - or you could detail it out much more finely. I would add drapes, even if they are just dummy panels, above the window/door, to add some softness and maybe pattern/color.

As far as color, I also agree that you need a more saturated color on the wall, whatever color you choose to go with. A darker gray-blue would work nicely. I would also consider something a little darker than your sectional upholstery in color. It seems kind of random in there right now since all of your trim is bright white. Kind of a wheat color would be pretty (although I just went back and read that the rest of the house is neutral - hmmm), and then you could add the blue/green, which you obviously like, back in in accents - the rug, draperies, pillows. Or, stay with the color you have but go with a grayer, more saturated tone. Ultimately a larger rug would be better (but turn it's position for now with the long side along the long side of the seating) with the sectional floating in the room would balance it out. Position your chair where the wicker one is now (the wicker seems too casual for the space. The buffet piece currently behind the sectional can go on one of the walls. If the sectional is too big too float, put the buffet (with lighting) along the left wall where the sec. is now and then snug the sect. up to it at a right angle. You can then run a cord underneath the furniture (but never underneath a rug) to the corner - add a floor lamp there. If you follow this layout, a large mirror over the FP always works, and then add some large art on the left wall over the buffet. I think it would help to simplify your accessories with fewer, but larger, pieces.