I made about 20 of these images between 1989 and 1995, and these are the fews I still have some (poor quality) photos of. So far, only the one on top has been restored somewhat by using computer paint programs. They were originally created with colored pencils, permanent and watercolor markers, ink pens, and some oil pastels.

Some sprites made for games:

Voivod wallpaper: (1024x768)

Some .gif animations: