Birds huh?
Ok, that was extremely good, if you want advice then I would say, maybe add colour to the sketch pad. I really liked the music, I love your other work too! Hmmm.. it is also possible, but difficult, to maybe switch between your draw flashes by loading externally your flashes into the same flash window. Its an idea.
OI have given you high marks here, and this dose deserve them! Well done and thanks!