I agree with #s 3 and 5.Are there any specifications for the entries or is it just a general, "submit a photo"?
I like 3and 5 best.
1 is good because it has both cats but it doesn't stand out IMO.
2 and 4 are good from a photography perspective.
But I'm sticking with 3 and 5.
It looks like the person who donates the most stuff will win the photo contest, not the person with the best photo (me, obviously).