The list of required photos is “published” meaning shown on the website so that everyone knows which photos to submit if they want to participate. Sorry, I see how that was not very clear. When votes determine, a photo is “displayed” meaning it is revealed for anyone to see. So for each round one winning photo would be displayed, and at the final voting round all photos for the winning/losing participant would be displayed/revealed for all to see.
I think having a blurred or redacted version of each photo may encourage more voting, but that would probably take a lot of work. If this were possible, however, then each round would start with all blurred entries from each participant displayed on the website page and after voting the winning entry would be displayed without any blurring. Not sure if the remaining blurred entries for that round would just stay blurred or be removed, doesn’t really matter I think.