Uhm well the text shouldnt be too close to the bubbles maybe a bite more space between them sometimes...first panel for example
Uhm if you place the "JRBLE" sfx so close to goku you need to redraw the whole rock in the background ^^
I liked the original "bom" more :P
Like des said, you definitely need to spend more time and effort centering the text within the bubbles, and making sure that the text does not look "cramped" inside the bubble (text should not be too close to edges of panels or bubbles!).