The Etherington Brothers have an incredible site for learning every aspect of Cartooning and Comics, as well as another bunch of tutorials. I'm not sure if Pinterest works at school, but try this link for a few ideas to draw.

Encyclopedia of Cartooning Techniques
Crave Painting Logo
Drawing Habit

Draw Rick & Morty, smiling at one another.

Draw Rick & Morty Face-stretch (Google Search)