Interesting idea, its pretty cool. Though, I would have rather you leave it uncolored and add some details, rather than coloring it on the computer. It takes away from the depth if you aren't careful. Anyhow, the proportions on this one are much better than your previous attempts, good job on that aspect. Other than a lack of much detail, the mask seems to be a bit 'square' in the front. But, other than those things, this is pretty good.