No offense, but it doesn't look so great as a shirt. My reasoning is
1) Shaded things don't work so well on a shirt
2) the coin design might be a bit too complex for a shirt, which can be kind of distracting
3) The words bitcoin.org are in a yellowish color, on a white tshirt.
However, it might look good in black.
If you are interested maybe we could work up some kind of shirt design together that would work a bit better?