Just trying to get this over with... I sat down and drew a step-by-step tutorial for Mario's face, and it took me forever to go and write the instructions / tips next to them. But I did it!
The font I'm using is AnimeAce 2.0 by Blambot. I plan to use it in my (NONPROFIT!) webcomics.
Like it says in the tutorial, please leave comments if it was useful, if there's ways I can improve it, or if you wanna see a similar tutorial for another body part / character.