With Premium and White Label version of Easypromos it's possible to set up one period to enter the promotion by submiting pictures and another period for the voting. You can configure this option by playing with the "Dates of the promotion" that you'll find in the settings of your promotion. In order to set up two different periods, you should play with these two types of dates:
1. Start and end of REGISTRATION date: this is the date when your users will be able to enter the promotion and send their pictures.
2. Start and end of VOTING date: this is the date when users will be able to vote for the entries.
You can set up the start of voting date to be later than the end of registration date, this way your users will only be able to vote once the period to submit pictures is finished.