*First of all a similie is a figure of speech which uses words such as: LIKE or AS. Also it is a vivid comparison between two or more things.
ex: Brave as a lion
*A metaphor is also a comparison, it does not use the words like or as, to add up, a metaphor is a word or a phrase which is not literal and applies to objects and actions.
ex: the curtain of night
*An alliteration, also a figure of speech that uses closely connected words. So the words are going to have a similar sound.
ex: She sang soflty so sofia sleep safe and sound
Saying this, I believe this is an example of a metaphor.