Tip #1: How to color in drawings better
(bucket tool sucks)
1. Create a new layer, call it "color".
2. Put that layer under every other animation layer:
Like this.
3. Make the default background layer a bright green.
(this helps you see the parts that you missed better)
4. Color everything in in the color layer and you're done!
PS: i know its more work, but at least it looks better.