The face is evocative of Karr but the details are far from a dead ringer. The eyes are the main focal point, as are Karr's eyes. The details of eyelids, lips, etc. are less important in a general impression.
To me, the most striking similarity in the drawing is the small body type, as seen from the skinny, pencil neck. Despite the questionable validity of psychics, the drawing could very easily have been of a man of normal or heavier weight, but it captured the definite impression of a skinny geek. I think that much is interesting and worth noting.