Zac Efron - Portrait

So this is a picture of Zac Efron (obviously..) that was the last assignment in my art class. I am pretty happy on how it turned out, but after my teacher marked it and kept it out of my sight for a couple days I realized some other things to work on it. I would fix it but it got sprayed with this stuff that prevents it to smudge, so I can't do anything else to it :'/

*This is my first portraiture I've done, which turned out fantastic for me since I didn't have any before-hand experience

Pencils used: HB, 2B, 4B.
Time Spent: 13 hours

Here's the reference I used: [link]
^I know the picture doesn't look a lot like the picture I drew, but I printed it off the picture at my school. The printer there is horrible and it only prints off black and white :/