They definitely looked a little creepy without any outlines and markings on them. I wanted to be sure that I got the outlines and markings as close as possible to what the actual cartoons look like. I used a pencil first for some of the markings- typically the faces and on Snoopy his ears. After that, I finalized the pieces by going over the pencil with a gel pen, and I made the "outer" outline using a black marker.
They don't look identical to what Charles Schulz drew, but I don't think they should. I think they turned out quite nicely, and the cast loved the sign.