[sassan]

Just a suggestion;
Snowyowl's point is well valid. Does all voters look at every image before voting?
How about giving a chance (Not obligation) for every voter to receive a menu asking if she/he wants to see the slide show of every entry before voting. If answered yes, then set the time and seat and enjoy all pictures or if too many, far above the set limit, then see the final selections for voting. Of course if voter has already checked the entries then get the permission to go to voting directly without software stopping him from voting before finishing the slide show.