Not sure.

Really I leave that up to you, but me personally I always love and find it pretty cool whenever you add your little story bit to it. Again though it's your choice: If you just feel like posting it the way it is, by all means. If you're down to give some context, that's fine too!

Giving you an Answer::

Not every Picture Needs a Story, so Id say Just Post Whatever you have, if you dont have a Story off the top of your head you can put in.
If anything, you can add the story later and just make a Journal, or a Cropped Images linking back to the image: Mentioned Story added.

Thats How Id do it personally.

Do whatever you like! But for your reference, a number of your posts have only a short blurb but I like them, and I think that is enough of a tease.