05-30-2007, 01:13 PM
Yep, you can do all of those... Layers should simply be logical.
Things that people can separate and reuse should be on different layers.
If you have 1 baloon, it should be on 1 layer. If you have 5 baloons in 1 pack they all should be in 1 layer. If you have 5 baloons in different part of the picture you have to make them on different layers.