Are you as beautiful as a flower a simile?

Yes. As beautiful as a flower is a metaphorical sentence, simile is a rhetorical device, from the point of view, the use of similes in argumentative essays, is a concrete thing to the abstract truth of the image of the expression, by means of enhancing the infectious force of the article. Metaphorical sentences, in layman's terms, is to make the reader more understand the meaning of the words to be spoken.