Here is a page from the Frankenstein's Cat storyboard for the episode Tail of Tails we did. This was drawn by Mr Gordon. This was for scene 33A, so you have panels 1, 2 and 3. It's better to have as many panels as you can so you get a good idea for the timing when doing an animatic. It also saves time and money later on down the line when you have more planned out before you get to the animation stage.
Hmmm, I dont know the best way to visually represent animatics really. Maybe I should upload some animatic clips to you tube then link them here. As well as the Dusty animation test mentioned ages ago.
There are also action notes and dialogue notes at the bottom of the page. I think I mentioned before that this episode has won awards!