Drawing monsters it is certainly not easy as it might sound. There is sarcasm in the headline and in fact monstrous monsters might not be terrific monsters.
This consideration brings us to the question: what is a good drawing of a monster?
Well a monster should be scary, unless you want to draw cute monsters (Lucia has prepared fantastic tutorials about those).
Like in all drawing you’ll do, you will want to hit a string with your artwork and in this case that string is a deep one.
You want to instill fear, awe, and concern in the heart of the viewers. Ideally, you want them to have nightmares after seeing your drawing, maybe imagining being chased by your creature, gasping for help (maybe I am exaggerating a bit here but you get my point!).
Look at this monster for example. Isn’t it beautifully scary?