Example: 

Edgar Allan Poe uses imagery, repetition, and diction in his poem, “Annabel Lee: to create a melancholy mood.  Poe uses romantic imagery of the sea and stars to evoke beauty and loss.  He uses repetition of key phrases like "Annabel Lee" to emphasize a sense of love and grief. Poe uses diction with words such as "chilling," "killing," and "sepulchre" show his sorrow.  His melancholy mood contributes to the haunting atmosphere filled with death and sadness.