I did this earlier in the year for a TAFE project. After exploring techniques and doing some expressive portraits (which i'll post up soon), we had to create a photo realistic portrait. I attempted to do so with hatching, and overall i'm pretty happy with it. I'd like to attempt it again if i get the time. It was tricky though, i took the left side of his face too far then had to spend ages building up the right side again.
He's got such a great face to draw. And the photo i was using for reference is fantastic. I'm pretty sure its by someone on deviantart (couldn't find it though), so creds to them.