I saw a pole that asked people's preference for long or short captions. The pole came out in favour of short. I'm not sure I agree this applies to every caption. There must be something between a 'one-liner' and a story?
I like the story of the fantasy, so I just keep writing until I've told the story that turns me on. (Hope it helps you, too.) If the image conjures up a lot for me, I share it. I also like leaving much more unsaid, so you can go off in your own direction. Better still is when a pair of pictures can be used to tell one story.
