The Composites is a fascinating new blog that takes literary descriptions and generates computer sketches. I don’t think the hair is quite right, but that isn’t too surprising. I doubt the computer software knows that description hails from the 1930s.
Other noir figures that have made it onto the blog are Patricia Highsmith’s Tom Ripley (the description is taken from The Talented Mr. Ripley; Ripley’s appearance changes through the Ripliad) and Pinkie Brown from Graham Greene’s Brighton Rock.
Sam Spade, The Maltese Falcon, Dashiell Hammett
Samuel Spade’s jaw was long and bony, his chin a jutting v under the more flexible v of his mouth. His nostrils curved back to make another, smaller, v. His yellow-grey eyes were horizontal. The V motif was picked up again by thickish brows rising outward from twin creases above a hooked nose, and his pale brown hair grew down—from high flat temples—in a point on his forehead. He looked rather pleasantly like a blond Satan. (Suggested by http://exygoddess.tumblr.com )