I did this Rule 63 Jet-Pack Jenny (Jet-Pack Jimmy?) as an incentive reward for the Kickstarter contributions from publishing Factor of 01. It was done with gray brush pens first and then worked with Prismacolor markers. I really like how it came out even after a bit of a color mix-up when I colored it in some bad orange light at Sketch Charlotte's regular meeting place. That's part of the reason that I don't work with color at Sketch Charlotte.