When you create a photo challenge, you decide how many points the player receives for taking a photo. The system will provide the points regardless of the quality of the photo; it doesn’t have the ability to evaluate the photo. If you want to review the submitted photos and adjust the scores, you can manually enter the Game Instance/ Match and make changes after the game has finished. However, this process is time-consuming, so most game creators do not do it, instead trusting the players to do their best.
The most important thing is that the players enjoy the experience. Part of that is giving equal scores for the pictures taken and not altering the scores they have already seen on their scoreboard.