Welcome to PixelJoint! Something I'd try to be more conscientous of in your future pieces is color choices - the shades of black, grey, etc you've chosen are rather desaturated, and there's not a ton of contrast between the shades of each color. (This is also the case for your Pixelween submission, where the colors are super muted.)
I like the idea, but the face area of the head doesn't really suggest a face. Very nicely-shaped hat, though! I look forward to seeing your future works.