The whole sketch is done with a single graphite HB pencil - only one. I tried out all my pencils one by one, most of the faber-castells, nothing worked up to my expectations.
Also, this image is the first one I ever used with GIMP, as a beginner I'd say GIMP is awesome! Thanks to F-Spot too, for the final round of touch-ups.
Finally, thank you, for your stay on this page!