well it's not required but there just isn't really anything here concept wise that's actually original. generally when someone makes a design about pop culture there is some sort of twist or gag or something to keep people interested.
another thing is how the whole design gets cut off, if you had kept it going through the whole shirt (top to bottom) there's a lot you could have done gag wise, having the poles go all the way to the bottom of the shirt alone would be a great gag (batman and robin sliding into the wearers pants HELLO! laugh-city!)
it just seems not thought out much. i gave you a 1 though because you draw well, but everything else about it is lacking.
listen to Ginette times two, she knows what she is critiquing you about. Possibly with a playground on the lower part of the design, and they are sliding down the pole towards a slide or swingset? Maybe have Robin already at the bottom swinging away!
About my design