Take a look at the Rejuvenation website. They specialize in period lighting.

Your room is really charming! Both Pottery Barn and Ballard have sconces that would be appropriate also. Have you ever tried your sectional against the stair wall?

I adore your space!! Be sure to add some lamps to the mix.

Not sure why you wish to add sconces to wall-here's a nice option: Quorum 5"w Capella 1-Light Wall Sconce Toasted Sienna/Golden Fawn 5401144