A simile can simultaneously describe, establish, and embellish a quality. “His manners are pleasant like flowers” may describe the manners, make them attractive, and help the hearer retain an image of them.
Nevertheless, analysis should not list every possible purpose without justification. The speaker’s context, the listener’s prior knowledge, and the selected shared trait identify the leading aim.
First analyze the wording, then justify the rhetorical purpose. Multiple aims are possible, but each needs evidence.