until then-- i came across this very talented artist, Ray Tsang, who is using it for portraits
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click on this link to view the video (you may need a Facebook account):
http://www.facebook.com/video/video.php?v=460159932413#!/video/video.php?v=460159932413
Here is a portrait he did using Corel Painter 11:
http://www.facebook.com/video/video.php?v=460159932413#!/video/video.php?v=423192617413
Here is a link to a forum in which he shows additional portraits: http://www2.ambientdesign.com/forums/showthread.php?t=25550
UPDATE/NEW: Here is a link to his blog: http://raytsangartist.blogspot.com/