Which Layers do i colour?

What layers am i to colour? only the wolfs head? how so i make everything else black like the wolf head if i am to colour everything?

Remus: If you look at the video groups in the Layers window you can see that the “Mule” one and the “Wolf’s Body” one have a lower opacity setting. You can also hide the video group layers that get in your way when colouring by clicking on the little eye next to the video group in the layers window. The Mule’s eye and beer bottle have already been coloured in for one frame for you to have an example of what the colour should be.