Nah, I don't trace from paper, too much work.
I start doing a fast sketch (on the canvas) and keep changing parts until I'm satisfied. Then I block the base colors I'm going to use, and from there I start cleaning everything, adding details, shading, AA etc, until I'm done.
And yeah, ptoing is right. The karakasa is one of the most used monsters in games, manga, cartoons etc.
It's one of the stereotypes of the bunch I'd say.