Film.com gathered the sketches of Guillermo del Toro from various sources, and the result is fascinating.
The above pic splits between a sketch and the final product from Hellboy 2. Notice how the lower face changed from statuesque to a chipped-rock look.
The above is my favorite spread, with a brainstorm on Pan’s Labyrinth I believe.
The filmmaker has sketchbooks that look exactly as you would expect them to be. Packed with indecipherable notes, intriguing doodles and an overall hypnotizing look to the page, in general. Kind of like his films!
Check out the full collection on Film.com