[RMS-Chef]

There are a couple of main ways to attack this.
First, you create the category and restrict uploads to admins or mods only. Then you can copy whatever user images to that category that you want in the contest and enable voting.
A second way would be to open that voting cat and allow users to upload their images until a certain date. You may want to close uploads to that cat via permissions after you have enabled voting, thats up to you but both ways work well and have their place.

An option I would like to see is perhaps a check box when enabling the voting like "close cat to uploads while voting is enabled" or something like that so it would be easier than going into CP and doing it via manual permissions. I think this feature would be used more often than not to that effect.