Create an imaginary person you want to write to in your journal. Alternately, it could be a real person, such as a child or a friend from grade school. Start the entry "Dear ___" as if you were writing that person a letter. Then in a brief entry, describe a relative doing something or telling a funny story.
Include face and hair details, eyes, body shape and size, and special characteristics, such as a cough or a limp. Put the person in action.
You will be graded on the vividness of the detail and action.