Pick sconces that will be centered beside the picture. So, measure the length of the picture and divide by 2 to find the center. Then from that center spot, measure at least 4 inches away to the left or right--that's a good place to mount a nicely centered sconce!

Ideally, you'll want two or so inches of just picture frame on the top and bottom, so you don't want a really long sconce because it won't look proportional.

Let us know if you need more help or sconce suggestions.

so are you saying that the top of the sconce should be mounted at the center point?

That will be where you put the center of the sconce. Pardon me--I didn't write so clearly at first!

Oh, okay. Thanks. The sconces I'm looking at are about 15 to 15 1/2" long. Do you think those would work or do I need shorter ones.

That will definitely leave the 2 free inches both above and below the sconce so as not to overwhelm the picture. That sounds like it could be a good size!

Thanks. I've attached a picture of the sconces I'm thinking about (hope you can open it) I have the double sconces in my dining room and thought the single ones would look good on either side of the picture. Or do you think I should get something a little wider?

Sadly, I can't see the picture. Do you have a link instead?

Sorry about that. Try this: http://www.countryporch.com/home-accessories/candle/sconces.asp

Here are others that may work:

http://deciture.com/shop/decor/world-market/tree-life-single-wall-sconces/