I have heard the most good feedback from people with threadless accounts. It is a huge community and you can have moderate success with a little hard work and networking there.
One tip, you might want to change the background of your design to the same color as their shirt template so it looks the same on all browsers, etc. On mine your design bg and the shirt color do not match and it could detract potential buyers.
I reccommend an addon like
colorzilla to get the image color off their page (its #231F20) and make it your design background so it matches up and looks neat.
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