Every Halloween I make white chocolate scary masks which look very realistic. I use the masks that have that soft white foam/rubber lining(i really don't know the name of it). They go for about 6 bucks, if I remember correctly. The plastic cover over the foam is the shape of the mask itself, so when you open the package the lining sits inside the front of this plastic "mask" cover, fitting into every nook,ridge and cranny of the scary features so the lining doesn't lose it's shape. Am I making sense?
Well, I use untempered chocolate or coating chocolate and paint the inside of the foam lining. I paint it a couple of times, particularly heavy in the eye, nose and chin area. Once the chocolate sets(I chill it), you peel the lining off gently, and every wrinkle and feature of the mask is revealed. Then you can either airbrush or spone/paint the shadows and gory features. I love doing the skull, and it looks very realistic.