I published a how to on instructables that shows how I created the drawings for “Wish You Were Here: Postcards From Our Awesome Future” with Packard Jennings and “PeopleProducts123” with Amanda Eicher. The process is a blending of analog and digital techniques that result in, what I call, a combination of a comic book style and “how to evacuate the airplane.”
The process takes you through the steps of finding a photo, creating a pencil sketch, ink drawing, converting to vectors, and coloring – all using free and open source tools where possible.
This process was developed and documented while at the Eyebeam OpenLab (with some tips from Packard Jennings).