Almost good...
I don't think you should ever have to make a sign pointing at something to tell what it is... I think you should take the time to make the drawing good enough so that people can identify it. Making a sign pointing at it is just lazy...
Those farts... They can be deadly...
Over all... It seems as you could be good in the future... I started off making similar animations... Also... If I were you, I'd look at people while they're walking, and pay attention to the movements. You can make them a little more fluid. Keep 'em coming...