That's a nice vector with it being your first one. If you are willing to do some touch-ups the following need to be altered:
~ Outside rim of all eyes
~ Al's shoulder
~ Thicker lines
~ Different background color because the dark blue really sets it off weird.
Just make sure that all your lines aren't jagged (you did mention in your description you know that though). I would suggest using shape layers with the pen tool if you used Photoshop. You can use that http://www.ferricorp.com/public/forum/viewtopic.php?t=202 tutorial which is very good.
P.S. I love your username. :D
