this animation wasn't too bad, but its just ok. just a few little animation things i would wanna see weren't there.
like for the beginning the pencil just scribbled and the balloon just appeared, it would have been fine if the balloon looked slightly sketched in as to not go so far as the pencil actually drawing it (which i would have also liked to see)

this other is just a little nitpick but when the balloon was rising up the string wasn't moving in the back and forth motion that a regular balloon would have.

that's really all that there is to talk about with the animation you did well those are just some things i'd like to see you advance yourself with, good luck i hope to see more animations from you soon.