age shouldn't matter in judging, just because someone is young and less able doesn't mean they deserver a higher score because they "tried hard" or something.
anyway.. to the design..
are the chess pieces on the shirt or just there to strengthen the shirt display? it's all very well rendered but if you going for the pun title "chest board" i don't think it completely comes across, and you should probably follow frickinawesome's advice.
on the other hand, if this is meant to be worn and taken off to play on, then you probably shouldn't have those chess pieces over lap the playing board.
About my design