Principles of Animation part 2
28 Principles of Animation-page 5
... To continue along this line of investigation...
This drawing would be called the "push off". Note that every line and shape on the drawing helps the upward thrust. Even the tail, which is still following the path set up for it by its primary force, the rump, helps by way of contrast and followthrough. Pick any shape on the figure and compare it to drawing #6 on the preceding page. Note how each shape changes to enhance the overall shape and action: the neck, the chest, the legs, the back, etc.
Even though this is just one drawing, there is no doubt about the action that is taking place in this part of the scene. This should be true of any drawing in any scene.
Consider Anatomy Alone:
Aside from its purpose in the scene each drawing can be analyzed for different aspects of drawing. The whole body is a caracature of an animal, but all the parts of a real animal are present i.e., head, neck, back, hips, tail, etc. And each of them work and move in a plausible way.
Anatomy, of course is essential to any drawing whether it has a direct reference to nature or is completely imaginary. Though a character and/or its action may be greatly exaggerated or caracatured, anatomy in a sense remains fairly constant. An elbow is an elbow and only bends in a certain way, and has its limitation. Liberties may be taken but the "reality" of even a cartoon must be kept or it will lose plausibility or credulity. It is not an easy thing to convert one's knowledge of structural anatomy to the cartoon medium.
It has been said that the location of a joint is more important than the joint itself. For instane if an arm shape has been established, it cannot have an elbow bend in an improbable place, no matter how well the elbow is drawn. Compare tiger's arm to that of a real tiger.
The pull of gravity is one of the most important principles to deal with in animation. Everything has a certain amount of weight and will act and react accordingly. One easy way to lose the attention of an audience is to have feathers falling like bricks or bricks falling like feathers.
A certain humor can be gotten by bending the rules but should only be used where humor or special effect is called for. In shorts cartoons defying the laws of gravity, weight, speed, squash and stretch, etc., is a the rule of thumb. In Disney feature cartoons such flamboyant abandonment must be handled more discriminately.