the lightning needs some hue work, and I agree with alyCe about the italics at the bottom. don't treat it as fine print, since it's a semi-slogan and bolsters the ad and needs to be visible. although i personally like the punctuation in the Buzz Kill / Kill Buzz tags.
the cable running from the guitar is a bit confusing, perspectively. is it running from the guitar out to the left side of his leg with lightning shooting out or is that more cable between his legs with the rat?
good work overall