Take your time to look over your photos. Grouping them into the three types, wide, medium and close-up will help your decision-making process. Compare your photos within these groups and look for the strongest pictures that support your overall story. Think about how they might be laid out on the pages of a magazine and what they will communicate to someone viewing them that is not familiar with the subject of your photo essay. Finally, you will want to choose one main shot to be the feature image. The one you are most happy with that best conveys your feeling for the story you are telling.