The "story-description" is a significant part of the artwork's presentation. It can inform, engage and excite the buyer.
Including in few words, a good description or a story about the artwork can increase the chances to sell them.
If you need some ideas, answer any of these questions:
What has pushed you to create the work?
What did you feel realizing the work?
What message or philosophy did you try to send?
What did you tell yourself in the subject depicted?
What sensations or emotions you intend to arouse in the observer?
Be sure to use complete sentences and correct English spelling and grammar.