Mad Skull. 9 cm. W x 10.5 cm. H (approx.). Ballpen on recycled paper. Postprocessed with Wacom Tablet + Gimp.

On the back of an envelope, this was sketched while talking on the phone and I choose to finish it later. Lack of space in the paper (it was near the edge) forced me to add the pointed top end of the "A" in Gimp.