Hand drawn stop motion

This is even different technique. My tools were a piece of paper, pastels and a camera. I took photographs of each step. This is the outcome:
http://youtu.be/R1o5xOKCoG0

I'm quite happy with it but I can't understand why is there a stop of movement at the start.


The second version has a lighter background. This gives it a cleaner look:
http://youtu.be/6ycXXR8roAI

I've managed to do it on all of the layers by creating an action that I've played over each layer.