Bill - I have 2 questions for you to consider:
1) What happens if there is a tie of the 1st, 2nd, or 3rd place photos?
2) What happens if the same person's photos place more than 1 prize? Since everyone can submit up to 10 photos each, what if a person gets their photos voted as say ... 1st and 3rd places. Do they get both prizes or only the highest prize?