The drawing shows how closely the casting and make-up of actor Robbie Coltrane as Hogwarts' caretaker, Hagrid, came to reproducing Ms Rowling's original idea. The black-and-white sketch was intended for the first book, Harry Potter and the Philosopher's Stone, which introduced the oddly- numbered King's Cross platform used to travel to Hogwarts. It leaves Harry's features to the imagination - he is just a baby about to be left by Hagrid and Professor Dumbledore with the Dursley family.
If you follow the link and take a peek at the drawing, I think you'll agree that writing isn't Jo Rowling's only talent. Too bad the image is so small, I'd love to see a bigger version of it. Ah well, maybe I'll get the chance to travel one day, and will stop by the Seven Stories National Centre for Children's Books, where the drawing will be displayed.