ok here goes, the font on the bottom is just horrible, try a different font and try to put somesort of effects on it, at least a stroke, the main pics are too heavily colored, change the blending option to color and you will see a big difference.
The thing at the top looks kinda thrown together and squeezed in, make it a tad smaller.
The background, well there isnt one really, get some brushes and start from there.
I agree with -FS-. Is that a white stroke around the pics? Take that out. Put some effects like Satin or Drop Shadow or something on the text and make the pictures stand out. It's a poster is it not? At least have one pic stand out like not blended in. I don't like the lines and how they are all mutilcoloured. Follow tutorials on background making and simple sigg making aswell and youu could make that poster look very good
Where'd you get the idea to use the Backlash font with the Royal Rumble? :s
Edge and Mysterio look horrible, the blending mode you used for them is, ugh. Your background makes little children scream at night. The tactic i use for background is clouds, try that. Duplicating layers can always help. If its supposed to be a banner, why the PS2 logo?
Sorry for the harsh rating, i just think it looks terrible. Take all of our tips, use them to improve it, then see what we think.