See the poem "What lips my lips

See the poem "What lips my lips..." by Edna St. Vincent Millay. In Millay's poem, "What Lips...," would you say this is a Petrarchan or Shakespearean sonnet? In what ways does it not follow either model? What is the rhyme scheme?

Why does the speaker compare herself to a tree in the winter (9)? What sentiments does such a comparison evoke? What is the tone of “What lips my lips have kissed, and where, and why”? Is it sad, morose, triumphant, reflective? There are a few questions here so please organize your answers logically.