onion skinning

onion skinning is a two step process. 1. enable on object 2. enable in viewport (see above )

 It's very handy when drawing your animation . 
1.   Your previous key frame is highlighted in GREEN that is onion skinning.
2.   Your following key frame is highlighted in BLUE onion skin .     
3.   DRAW between your previous and your following key frames. 
      That is your IN-BETWEEN key frame. 


It's that easy.  Give it a try !