We start with something very loose, I’m not sure what I’m looking at actually.
For quick animations like this, I like to leave the background layer there at first; however, if I want alpha transparency later, it makes things more difficult.
This is because each ‘frame layer’ only has the black lines, the ‘character’ is not filled-in. Setting the whole animation to have transparency would make the character ‘see-through.’
There are better ways to do all of this, but I get around this by either going-back and filling-in any needed areas, or just dropping the transparency option and going with a solid background to make things easier.