I started with a test of Carla that helped me to define the color palette.

Then, I drew a keyframe of each of the scenes I was supposed to illustrate, composing the characters of Alba and Carla with independent and interchangeable animated objects. I mean I worked with Flash... 

And finally I animated it, and send them the scenes. I had thirteen days to do this commission, you can check some samples of my animations here:

You can watch the final video here.