Study the image(s) carefully and then write a story about:

1.  What one of the people might be doing/thinking/feeling.  What's thier story?  Why do they do what they do? Make it real.

2.  What the setting of the image is.  Include time period, location, climate,etc.

3.  What elements of fantasy would do in this image (gods, goddess, elves, orcs, warlords, fairies, etc.).

Here’s some practical things to remember

1) The small idea
Look for the smaller ideas in larger ones. To discuss the complex interrelationship of parents and children you'd need a novel. Go for a smaller piece of that complex issue. How kids feel when they aren't included in a conversation. What kids do when they are bored in the car. Middle child. Bad report card. Find a smaller topic and build on it.

2) Bury the preamble in the opening
When you write your story, don't take two pages to explain all the pre-story. Find a way to set it all in the first paragraph, then get on with the rest of the tale.

3) Start in the middle of the action
Similar to #2, start the story in the middle of the action. A man is running. A bomb is about to go off. A monster is in the house. Don't describe any more than you have to. The reader can fill in some of the blanks.

4) Focus on one powerful image
Find one powerful image to focus your story on. A war-torn street. An alien sunset. They say a picture worth a thousand words. Paint a picture with words. It doesn't hurt to have something happen inside that picture. It is a story after all.

5) Make the reader guess until the end
A little mystery goes a long way. Your reader may have no idea what is going on for the majority of the story. This will lure them on to the end. When they finish, there should be a good pay off or solution.

6) Use allusive references
By using references to a commonly known story you can save yourself all those unnecessary words. Refer to historical events. Use famous situations from literature. If the story takes place on the Titanic you won't have to explain what is going to happen, who is there or much of anything. History and the movies have already done it for you. Beware of using material that is too obscure. Your reader should be able to make the connection.

7) Use a twist
Like #5, the twist ending allows the writer to pack some punch at the end of the story. Flash fiction is often twist-ending fiction becauseyou don't have enough time to build up sympathetic characters and show how a long, devastating plot has affected them. Like a good joke, flash fiction is often streamlined to the punch-line at the end.