Cool idea! Here's some I know.
Squint your eyes, to see the value in your drawings. if things become blurred together, they are too close in value.
Internal Colored Lineart - coloring all lineart takes way too long, but if you only color the lineart on the inside of things (like the internal finger outlines on a hand drawing) then it can look really cool!
Shape Design - if somethings hard to shape, if you draw varying connected triangles, big medium and small ones. That can help you shape it well. Ethan Becker on Youtube has some videos about this.