A strong caption can enhance a strong image.
Providing descriptive details helps the audience better understand and appreciate a striking picture: Why is that fish swimming amid a jellyfish's tentacles? A good caption helps tell the story behind the photo.
A well-thought-out caption can also make the photo a more immersive experience for the viewer. I felt a jolt of adrenaline reading about the sights and sounds the photographer experienced before the sun rose in his photo. Knowing the stormy conditions the photographer endured to get his shot gave me goosebumps.
The foundation for stunning photography often rests on illuminating caption writing.