G.B.
Candle sconces would probably be the wrong size scale to flank the mirror anyway. You need to keep the proportions in mind. If you have a really large mirror, small little singular candles would look out of place and just get lost. You can get large decorative sconces that are like shelves, with carved bottoms that go into points. It is hard to explain...and then atop of those put green plants (even fake would be ok) perhaps trailing. I would not put more brown. Sounds like you already have a LOT of brown going on in the house. ..and that is fine, but bring in some accent color. Let the brown stay at 70%, bring in a second color at 20% , and a third at 10% for splash..
If you have white walls the brown contrast is too sharp for the eye. Soften the transition between the two with taupe walls or depending on the tone of the sofa, you can go with the color of the sofa just in a slighlty darker tone or a slightly lighter tone. If the room is quite large a slighty darker wheat tone would work but if the room is on the smaller side, stay with a lighter tone than the sofa. In fact i would go way down on the color strip, to a VERY light wheat. You typically can't go wrong by staying light and neutral (but not white).
I tend to lean towards light soft golds on the walls as my personal favorites because it makes walls glow like the sun is setting out the window. It is just very comforting, whereas some forms of taupe is more stark and can look like it has slightly pinkish undertones late in the day. Whites are ok in the room but not on walls, perhaps as colors in mixed color throw rugs, a candy dish, ect. Some forms of green in a very light tone could work on the walls too, and then you'd bring a darker tone of that green in for fabric accents.
I also LOVE burgundies with browns, it complements the richness of the brown and will make the room seem more dramatic and feminine at the same time, without adding feminine colors like pink. The burgundy will make it feel like there is a female in the home and it is not just a man's pad. I might consider burgundy velvet throw pillows and also paintings that have the fall colors, burgudy, greens, golds, etc.
Some people will like to go with easter egg blue with the browns instead. It just depends on what you like. Greens and blues are cool colors, browns , golds, reds, are warm colors. Mixing cool and warm colors is usually comfortable. What kind of room would you feel more comfortable sitting in? Choose that route. Professional decorators can mix 3 -5 colors together successfully to make a room feel less contrived and more like it has evolved over time. Go to the book store and pull a bunch of decorator books and just look at the photos. Look closely at the color percentages they mix together. One of my favorite decor books is called Comfort Colors. It talks about the skill of mixing colors and how they make people feel, with lots of big photos.
You can go to a place like lazyboy, and go look in their fabric selection area to see if there is any fabrics you like that have some of the same tones of wheat as your couch. Pull out other colors from the fabric for your contrasting colors. Have them make pillows out of it for you. Order extra fabric to use around the room.
Pull your different colors all the way around the room. Try for three different spots in an invisible triange. If you have a burgundy floral in throw pillows on the couch on the south wall, Make sure to try to get some of the same floral fabric in the area of the north wall, perhaps on the tiebacks and header of the solid color drapes. In the east area , maybe in tablepads.
What is the large round mirror going to reflect? If it relects the front door, could you flank the door in tall ficus? Or put a beautiful heart shaped wreath on the inside of the door? It is nice to see pretty reflections.
A throw rug in the entry with a console under the mirror would be nice. An umbrella cylinder with some umbrellas can add to the mix. Books are nice laid down and stacked on the top of the console- and then I like to put a stone statue, perhaps a horse or something like that, on top of the stack.a small to medium size plant to the side, or a floral arrangement is even better.. A large wooden dish to hold keys and cell phones might be appropriate. If the entry is really quite large and you feel you need to 'fill' it, two arm chairs turned slighty towards eachother, with a round table in the center of them, all centered under the mirror and against the wall, could also work. Put a LARGE beautiful vase of florals on the round table, hopefully it can partially be reflected it the mirror. Flowers are a very welcoming thing to smell and behold when someone enters your home. Or, you could put a VERY large, wide potted plant under the mirror, and then flank each side with an identical 2 or 3 seater wood bench, covered in different colored throw pillows, with a long runner rug in front of it all. Put a set of three small to medium size paintings in a row on the wall above each bench. (artwork above sofas , benches, consoles and headboards should take up 2/3 the length of the item below it. If the console is 5 ft in width, you wouldnt want to put a 6 foot wide picture and you wouldnt want to put a two foot wide picture above it. a 3/1/2 to 4 ft wide picture area would look better.
Hope some of this helps.
Gail