
Basically, we can use particles to paint. There are 5 particle layers here. They simply move some strokes from left to right:

Then the vector layers from each particle are distorted by a mesh.
So there are 5 meshes, one for each particle.


It's not visible in this gif, but over all that there is another mesh which distorts all the other meshes. That allows to animate the face (and make the character blink, turn the head, etc)
