I'm with SimeonTemplar and MysteryMeat. Great start, but the shading and skewed proportions should be pretty high on your objective list. I took a quick crack at adjusting them a little to give you a nice side-by-side comparison. Also, you'll notice that I marked the jaw line rather than letting it continue into the neck. This is because assuming you're going with the standard 3/4ths view, it would not be possible to see it as a continuous strip from this perspective. Thing 1 is the original, Thing 2 the revised.