So I decided to crank out an RPG monster idea and draw it in an hour. Roughly 70 minutes total, so not too shabby! I sketched it out with...
Recycling Your Trash Mobs (Goblins)
Annotated 5E Monster Stats
OSR Log 4 - Fall of the Immortal Headsquisher
OSR Log 3: The Reign of Hisziphit
OSR Log 1: Almost TPK