Just click the pencil , move it , click again and keep on doing it over and over again. Try and stamp the pencil as many times as you can . Press C to clear .
PLEASE NOTE: because of a glitch that I am unable to fix , you can only move around the pencil in " see inside " mode and it lags when on full screen . Apart from those minor issues I am pleased to say that this is my first project in which I sketched all the sprites instead of