This was really hard because I barely know illustrator (I dabbled a few years ago) and I chose a challenging picture to boot. It has it's problems, but overall I'm pretty happy with the results. I really wanted to convey my expression in the picture.
I made quite a few little adjustments, some to the shape of the face which I think helped better capture my expression. This should be the final final one. As long as I don't re-open the file in illustrator: