Bertha is an Assfaster Class StarFreighter piloted by the Sower, Resin Methas in his quest to bring the forbidden seed to the universe.
This piece is 24" x 36" and I started with a sheet of bright yellow smooth drawing paper. I used pencil to rough it in based on a sketch I had done, and then blocked in the color using berol markers. I finished it off with colored pencil, rapidograph style pens, and opaque white rollerball pens.
I used this as the basis for a 1" to 1' scale acrylic model you can see here...[link]