2 things that I notice that stick out to me right off the bat that look wrong are the parental advisory logo. It just looks like it's slapped on there and randomly placed. Maybe try moving it to the back just to the right of the word "concert" towards the bottom.
The other thing is the text in the back at the top. It's not that bad, it's just that you cant read it at all in some spots. His face is like the same color as the font, and that is just a no-no. Maybe change the font color, or find a different PSD or pic to put in the place of that pic.
Other than that, I really don't see much wrong with it. It's not bad. Nothing to really say cept for the bad things that pretty much need to be changed imo in order to look right.