I watched your Event File. ^-^
In how to describe tigers of bottom, it was studied very much. ^-^

When OC separates a background and a character and draws it, I delete a background of a part piled up.
Or a device to increase an addition layer is necessary to become white.

A layer of OC is very unique. ^^;

oC layers are Multiply mode by default, but can be changed to Add or Subtract mode by clicking the symbol next to the eye.

In Add mode, pure black is not seen, and any other colour is applied in addition to the colours on layers below, giving a result leading towards white.
Pure white on an Add layer will seem like an eraser against layers below.

In Subtract mode layers, again black is not seen, but other colours are applied negatively to layers below giving a result towards black.
Here pure white is shown as black.

I fave this one too, because the drawing of orange-rah-with-feets-on-springs is even happier than the real thing.
He keeps making me smile.

And you have to show me how you made your icon fade between the images, coz I don't know how to do that. :)

I made it in Image Ready, just made two layers, one for each pic, and then changed the opacity of the top layer by 25% each frame. There and back again in 8 frames.
You could do it with GIMP and a freeware animated GIF creating program too.