I don't rememeber if you are disquilified for using the same subject on different challenges. What I mean is if I submit one photo this week can I re-shoot it for another challenge down the road?
You can shoot the same subject every week if you want, you just can't re-use a photo...I think there was a a period where we saw the same cats and kids with "excessive frequency" though...and it can lead to a loss of anonymity for your entry.