Portrait drawing

Have you ever watched Person of Interest? The series is about an ex-CIA agent, John Reese, and a mysterious billionaire that prevent violent crimes, with the help of a machine that can predict events before they happen. The series show how people are being watched wherever they go.
John Reese is played by Jim Caviezel , the actor that played the role of Jesus in Mel Gibson's film.

Here are some photos with my drawing process, for the portrait of Jim Caviezel. I used graphite and colored pencils.