Camera Work/Technical: A bit off focus, but the exposure is dead on. Nice WB to create a nicely tined image.
Lighting: The lighting looks good. No overbearing hues or weird tones anywhere in the photo.
Composition/Content: You captured a very interesting expression from an obviously interesting character, but there was really nothing outside the title to link him to his environment. Keep in mind that many voters overlook the title initially to determine if the shot meets the challenge.
My Opinion: With a little more focus and something in the frame to link him to his environment, this would have drawn a much higher score. Your post-precessing worked very well in this one, too. Looking at your profile, I appreciate the fact that you enter a lot of challenges. It took me 10 months to enter my first 9 challenges. You've done it in under two. Great dedication to learning how to make images that are more appealing to others. Keep shooting and keep entering. I look forward to critiquing more of them.
The disheveled look represents an exhausted student well, but unfortunately it doesn't look like you put much thought into the backdrop, there is not much to suggest school or student.
Other than the title I would've never guessed this was a grad student, perhaps the guy in the cubicle next to you that keeps sending out the bulk emails, but not a grad student.