Staging
'Staging' is a principle of animation which is fairly broad in meaning, referring generally to where you are intending for the audience to look. Bad staging will confuse the viewer with no clear focus on the intention of the scene.
Ask yourself: 'What is the purpose of this scene?'
The point is to be clear in what you're communicating. If you need a character's facial expressions to be the focus, use a closer shot. If you need several characters involved in action, place the 'camera' further away.
It can be easy to over-complicate the picture, particularly if there are several moving elements within one shot. Consider what the primary action is and who the main character is. A background character could easily disrupt the shot if they are upstaging the primary action, either by taking centre stage or timing their action in a way that interrupts.
Think about timing. Does the audience understand what just happened, do they need a pause before the next action takes place? Always be clear.
It can take a second to register what is on the screen, you can easily forget this when you're wanting to cram the scene with a lot of action.