Perspective is something that we all need in life and it gives your drawings a deeper meaning as well. When first understanding perspect you need to understand that there is always a vanishing point that existing on the horizon. This point provides the central point for perpective in your drawing, anything above it is birds eye view, anything below is worms eye view...

Action lines give your drawings a sense of activity and often show the exaggeration of the activity. You can show not only that a ball has been moving, but that is has been bouncing quite high or flying very fast. There are some simple tools used to create these affects and you can see them in action in the diagram in this post. Notice that lines are used to show the...