Is this a good impression from DBZ, 10 points?

Yes it's great! (my honest opinion) But I was surprised when I watched the first time because his voice (the original) doesn't sound anything like Picollo the rest of the show. So to answer your question you did a great impersonation to his voice at this part, however Picollo kinda sounds different in this part. But you do nice impersonations keep it up!