The animation is quite good for a beginner. The built-in tutorials for flash are actually a very good start. My suggestion for the first two would be to change the font though. It's very Art-Deco now, which is a design and art style from the early 1920s. DBZ wasn't really around during the 1920s so the styles clash.
Also remember that animation should enhance existing design, not replace it. I think there are still a few visual issues you should work on: balance, color, images. Make a sig look good, then add animation that makes sense.