Really nice design, it just needs some adjustments. If you resubmit you might want to considering adding a little more contrast between the colors. They feel to close to each other that it's muddying up the image and making the image look flat. It needs more shadows. Considering where the light source is, the grass in front should have some shadows falling on the lunch box.
I agree with the placement, definitely too low. Get in the resubmit early so you can get the votes back, just tell people so they can come back to vote for it.