Needs improvement.
For a beginner flash, it was decent. Though there is room for improvement in a couple fields. First off, it'd be wise to add a preloader. NG offers them in their download section. It's basic, but it'll get the job done.
Besides the song playing in the background, there wasn't much in the sound department. Some punches, kicks, blasts, and charge noises would make this flash much more authentic. Also, you need to learn how to compress your sound. This flash easily could've been sized down to about 2MB. You'll wish you had that extra room when you start further developing your skills.
As for the actual animation, while a little jaggy at times, it was decent. The thing that annoyed me the most was the background moving out of place. But perhaps you intended to have that effect. After all, this is a DBZ flash.
All in all, while not spectacular, it was ok for your second animation. I would suggest brushing up on some online tutorials before submitting another, particularly on onion skinning. This will help your animations become much smoother.