We use a small recessed directional light placed in the ceiling. We placed it far enough back from the mantel so that I could direct the light on the painting.

If you space 2 recessed lights a foot apart them aim them ito each other, you'll get a nice wash of light over the wall of the mantle.

That was suppose to read "into"

Will there be enough light pointing down with the ceilings being 10 feet? That was my concern.

Also, I wonder if these spotlights would be better than recessed:
http://www.elights.com/progdirlig.html

Thanks everyone!

Yes, I have 10 ft. ceilings and it's plenty of light. I can't really say if those lights will give more light or not. You'd have to ask the experts on the lighting forum, if you can get someone to respond.