Sluggy the Slimy Slug-Monster (revisited)

Continuing with colouring in some old line drawings as a substitute for actual creativity, this is one I did a couple of years ago to try out a new brush pen I'd just bought.

Gug

 Here's one of the Cthulhu Mythos creatures from the recent Bones  Kickstarter, a Gug. I really don't know what that is; I'v...