I read through your work, and well a couple made me smile, but at the same time I think, using the old teaching adage, you "could do better". Theres potential there, I liked cloning around, but I feel some of the jokes dont work, or Ive seen them done before, or maybe could have worked better (low budget films ones for example is a good idea but Ive seen it done funnier, there is a film in 3 panels thread on here somewhere, Im sure a thread monkey will track it down for you, have a gander and see what you think)
Don't be disheartened, you are on the right track, continue your quest for the funny. If you build it they will come.