Ditto on those two books! Had to go off-line and do some rendering. Here is a thought experiment. Imagine a guy throwing a punch and you are filming it. What you get is a sequence of images. While they are all necessary to comunicate the 'action'. The two frames which convey the most energy are the first frame and the last one. The first frame shows all the pent up energy of the comming blow, and the last one shows the release of all that energy. Another trick is to sometimes change the camera angle. Imagine you are drawing someone's face, by looking straight at the face it looks flat, featureless. But by having the person turn their head 45°, you add angles that were not apparent before making the face more interesting. Here's the first of two pics of a great pose I made of a sword attack. This is a 'head on' shot.

 Don't sweat the petty things, and don't pet the sweaty things!  ; )