Open up a blank document and paste whatever you have copied right now.
If it’s text (whether on a picture or not), use it in a story. Try to make it the first line.
If it’s a picture of a person, write about that person’s emotion/expression (More than one person? Pick one. Feel free to use the others as side characters).
If it’s an object, write about its owner and their relationship with the object (memories, etc.).
If it’s an animal, write about how it relates to its surroundings and what its life has been like.
If I haven’t listed something in a picture you may have copied, then figure something out along the lines of what I’ve listed above.