Mirror design to help see construction flaws
Lay in your ground plane; go over basic rough anatomy, make sure everything's connecting where it should
Fix whatever needs to be fixed in the anatomy
Go over the drawing again to start setting up the painting.
Keep changing the design as you go along if you think up new ideas!
Read the script several times. Don't start drawing until you have the scene in your mind.
Figure out how many shots you need
Figure out what the establishing shots are
Do thumbnails--should be just for yourself; should be super quick
Storyboarding is not really about drawing--it's about getting the feeling
Action scene--know what your scene needs--don't get caught up with thumbnailing your in-between shots early. Be economical with your boarding early on.
Drawing gridlines--draw them for you, but they help the audience to understand the space. Know where your camera is, and know where all your planes are.
Lay down your gridlines really quickly--even if there is nothing there. Perspective goes hand in hand with the mood of the scene. Think: how does this shot make people feel?
Sad or defeated scene--make the character feel as sad as possible. The scene/environment should feel heavy on him.
Happy shots--triumphant--up angle shot.
Don't do flat perspective all the time. It gets really boring then!
Always lay your grids down first.
Character expressions: don't take any part of the face for granted… the eyes, eyebrows, nose, etc.. Don't just draw a bunch of expressions; break each one down a little bit. Draw typical, sad, surprised, quizzical eyebrows (only)… and then next to that row, play with different ways to draw the eyeball… and then the different mouth shapes.
Know your characters' extreme squash and stretch in their expressions!