I like this; it looks really nice especially with the new palette, but I'd say you should change your skin highlight to something warmer than what you have now, because after looking at it for a bit it looked as though there was a hole in your face. The contrast in your most resent update, while the mid-tone and highlight have a good amount of contrast, the jump between the mid-tone and shadow is a bit harsh, it might look better if you just lightened it a tad.
Other than those few nitpicks though, this is a really awesome piece; the shading is great and everything fits together so well.
I'd love to see more from you!