1. Don't have people just standing there.
2. ANY expression is better than a blank stare.
3. Avoid tangents and any straight line that divides the panel.
4. If you use an odd angle in the shot, there has to be a reason for it.
5. If you don't have at least one panel on each page with a full figure, your "camera" is too close.
6. Plan out your shots in "Lawrence of Arabia" mode rather than in "General Hospital" mode.
7. Don't think of backgrounds as "things to fill up the space after the figures are drawn."
8. If you know what something is called, and you have an internet connection, there is no reason to draw it inaccurately.
9. If the colorist has to ask if a scene takes place at night, you haven't done your job.
10. If you can't extend the drawing beyond the panel borders and still have it make visual sense, you've cheated on the perspective.