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"• It's possible to join the contest at any time."

Please, tchek the rules of the contest here:
https://steemit.com/portrait-photocontest/@flamingirl/contest-50-sbd-7-days-portrait-photography-contest

Little bit confuse about paper prove lines. Me street photographer. I post only my photo. My all portraits are containing street people. I use my mail address into my photo for copyright issue.

If you are a photographer, you have the photos saved in your camera, the original unedited for example so it's not a problem to put a proof in your entry =). This is to avoid fraud because there are many Steemit and I do not want to reward stolen photos so the only way is the proof that your photo belongs to you. Thanks for your understanding.

I agree with you. Thanks for helpful reply.

I submitted photo. here, i am new. I don't know it's ok or not. Hope it's ok. Thanks for helpful tips.