from training.npr.org: https://training.npr.org/2016/01/12/these-are-nprs-photo-caption-guidelines/

These are NPR’s photo caption guidelines
Captions give photos context, telling viewers what’s going on in a photo so they don’t have to guess or jump to conclusions.

How to write great headlines that keep readers engaged: 5 tips (and examples)
These tips and tricks will you help write stellar news and feature headlines.