This is John Mandrake, one of the main characters of Jonathan Stroud's "Bartimaeus Trilogy" which contains "The Amulet of Samarkand", "The Golem's Eye" and "Ptolemy's Gate".
John (which's real name is Nathaniel) is a young, ambitious magician, who want's his carrier to go up at nearly all costs. But, unlike other magicians from the British government, he still have tiny little remains of conscience deep inside of him.
I hope you'll like my drawing, especially those who read those books.
And to those who hadn't, I deffinately recomend you to do so!