EDIT : Added closeup of the print quality!
Well, I guess I didn't win the tshirt contest. So I decided to put my design up at society6. [link]
I also changed the color of the original design.
I bought a tshirt myself just to see the color and print quality and both are excellent! I'm wearing a size M, since they do shrink just a little after going through the washer and dryer.
Also, the colors will fade a bit if you run them through the washer and dryer (I just chuck my clothes in; it might help if you turn the shirt inside out or put it in the laundry bag). So if you want to preserve the print, hand wash it and hang it up to dry.
You can buy it here! : [link]