I Would like know if Can I seller plans i my Contest Photography for the photographes.
I don't quite understand the question. Do you want to sell PollUnit plans. Or do you want to sell photos?
I put your answer here in the support forum, so that others may also benefit.
photographers will submit photos to compete for prizes. Can I charge photographers to participate in the contests or would that have to be done outside?
At the moment you can not charge photographers any fees within PollUnit. You are not the first one who asks for an entry fee feature. We already planned to integrate this. But we do not know when we start developing it. Once I have further information I will post it here.