its a Hannya mask, from japanese theater. The mask is of an evil woman who has turned into a demon... this piece was inspired by my ex-wife... pure evil.
Link for inspiration of mask: http://library.thinkquest.org/05aug/00717/pages/masks.html
You gave the mask a rusty metallic look. I was checking the reference image and was nicely surprised, good job. Not sure if you intended to make it this way though :)
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ex wife? pure evil !
XD