You need the Flash Player or the IOS or android app to see the bombings in action.
You have to activate Flash for this page (even if you have it installed already).
Here is an image that shows how to do it:
how are you getting the perfect curve's?
I am painting on my computer with low sensivity on my mouse and mostly I paint the lines a second time so the color has a good contrast to the fillin.....the rest is just practice... I've also tried it on a touchscreen with a pen but with that you have to cut much more to get a clean result. I hope it helps you... Peace dude.