The vote is for the best image, so if you submit 4 images, each image has an equal shot at the prize. Theoretically, a single member could take 1st 2nd and 3rd all by them-self. The gift certificate prizes however will be awarded to the top 3 ranking members. So if one member does win 1st, 2nd, and 3rd, that member will only receive the gift certificate for 1st place. 2nd and 3rd place gift certificates would go to the next eligible runner-ups.