Very nice, the skin tones are great and the BG doesn't distract from the focal point, the portrait.
My only nitpick, and it's small one at that, would be that the eyes need a tad bit of sharpness to them to express the whole ''windows of the soul" more clearly in the painting.
I've never heard of OpenCanvas before, as I strictly use PhotoShop, but I love the painterly feel you gave the image, something sorley lacking in PS 6. Can you point me in the right direction?
Drawn and colored on the computer using OpenCanvas
"The Enrichment Center is required to remind you that you will be baked, and then there will be cake." - GLaDOS