Ink on Paper (7.5in x 10.5in [19cm x 27cm]). This is one continuous line (see if you can spot the beginning and ending points). I've been doodling like this since I was in high school, but I've never tried to actually make any specific images with it before .
P.S. I'm heading out of town tonight through Sunday night. As usual, I will do my best to post the skulls I make while I'm away on the day they're done. But, rest assured, even if they don't get posted until after I've returned, I'm still making them every day!