First off I've entered T-shirt design contests and you had to create your OWN design.
Not treat it like it's another signature. It feels a hell of a lot more gratifying when people say they would wear something you created.
Obviously that is not the case with your T.
This is Treyarch concept art.
The effects were made by other people, composed and jammed together by you via photoshop.
I have no problem with that, obviously I'e done the same with signatures.
Just think the contest itself is pretty lame that they treated it like any other Photoshop contests and set no prerequisites regarding originality/copyrights.