Ok, Official area for my stuff.

[Ego]

Huh. Sorry about the rotating thing, but the bulge at the end is very reminiscent of a rotation, and with the vertical one there too, I made an assumption. I can understand it if its a piercing, but it definitely doesn't come off very easily. It blends with the skin tone a bit, and because it isn't a standard piercing location it comes off as a mistake. Maybe it could contrast a little better if you used the darker blue from the pants.
The pants are infinitely better though, zipper is right on now. On the pants, you can use the knee highlight color on a couple of other spots on the pants as well, as it looks a little extreme to confine it ONLY to the knees. Hat is getting there, but I'm not the right person for this. I recommend you actually get a hold of one of those hats, or at least ask someone who wears one. Still, black outline it.
Shoes look better.
Something about the vest shading is still making it look a little messy. Remember that you don't have to go into shadow as you approach the zipper or the purple thing, as it's not enough to cast a shadow.
You should probably put a bit more shading on the main part of the face.

Well, good luck with this, and your exam tomorrow too!