A photo feature is something that tells a story out of an image. Image could be some times seemingly simple but might tell an impressive story or might evoke a strong emotion.
The photo could be a place of historical importance. It could be the same location but at different times showing the significant changes.
It could be a local event like festival, an incident or even an activity of great historical or social relevance.
It could even be an still object that brings up a story. It could even be a face that draws up a compelling story line.