Police Sketches Of Literary Characters Based on Authors' Descriptions

Illustrator Brian Joseph Davis used a law enforcement composite sketch software called FACES ID to create the faces of literary characters based on the descriptions of the authors. You can see them on his  Tumblr blog, The Composites, along with the passages used to make them. Davis used "educated guesswork" to fill in the features that were not explicitly referenced in the texts.

SHERLOCK HOLMES - A STUDY IN SCARLET BY SIR ARTHUR CONAN DOYLE

"His very person and appearance were such as to strike the attention of the most casual observer. In height he was rather over six feet, and so excessively lean that he seemed to be considerably taller. His eyes were sharp and piercing, save during those intervals of torpor to which I have alluded; and his thin, hawk-like nose gave his whole expression an air of alertness and decision. His chin, too, had the prominence and squareness which mark the man of determination."

He has also compiled the illustrations in book form.

More: Mental Floss
Via