Ace race, baby!
I, for one, welcome your mouse pointer.
Did you make the dragon shadow with your hands?
That would have been easier! I printed a dragon out, cut it out with an exacto knife and propped it up with strings.
One thing that I learned about the flash was to use the multi-stroboscopic mode (around 30Hz or so) and press the test button. It looks exactly like a flash light and you can get an idea what the shadow will look like. Don't hold the button down too long, it tends to overheat the flash bulb.