I like your choice of the shallow DOF but for a true product shot, I think they'd want just a bit deeper with more of the product in focus. Very good even lighting. (Commenting only.)
I've looked at this image, reviewed, and reviewed. For some reason, I'm reluctant to declare this one my favorite and I'm not sure why. But it is in fact my favorite of the challenge. I like the softness and depth created by the blur. Excellent simplicity.