One artist friend who is doing very interesting work incorporating three dimensional masks into his paintings is Don Michael Jr. His creations are so engaging, he has developed a technique for creating masks that are then integrated seamlessly into his paintings. His work may be viewed and read about on his blog site: http://www.donmichaeljr.com/blog/.
His series of paintings can also be seen on a music video called Manic Twilight, which can be viewed on You Tube, which exhibits many of his mask paintings. The link for that is: http://www.youtube.com/watch?v=6BR5rI9kgv4 . Take a look at his work!