This is a type tee, admittedly, but the slogan isn't scoring well, so I mocked up a tee and submitted it. They declined. I just like the way this looks, so I put up this critique so that I can click it and look at all my design sexiness.
I guess I could actually work on this if there are suggestions.
I'm guessing they'll want the robot to be given some depth and color or something, but I really like how this is super simple. Oh well.
You could try making the design more illustrative but then maybe have the robot saying "I have nerves of steel" in a speech bubble or something?
I have some crits up if you wouldn't mind taking a look...
http://www.threadless.com/critique/55687/Flock_Wallpaper
http://www.threadless.com/critique/55885/Many_hands_make_light_work
http://www.threadless.com/critique/52684/Buzzkill_Caddy
Based on my slogan, which you can vote for here.