I've been creating Creepers for a few years now and thought I might give you a quick rundown on how I do the artwork. I start by sketching them out on tracing paper with colored pencils. I like using Prismacolors because of their soft lead and variety of colors. Once I have the rough sketch down I tighten the drawing up using a dark colored pencil that scans well. I scan it and save it as a Photoshop file, then I use the sketch as a guide to do my artwork. I use Photoshop because it's what I'm most comfortable with but I use it just like Illustrator, I create all the artwork as shapes with the pen tool. And I use a lot of layers for quick color changes and so I'm able to move shapes around easily if needed. I do some detail work and any lettering I use in Illustrator, the lines around the Angry Imps eyes are in Illustrator for example. When I'm done I save the artwork as a jpg. file and it's ready to post.