The theme of Christina Georgina Rossetti's poem "Helen Grey" is, beauty isn't everything. We know this to be true because the Rossetti describes Helen Grey as "handsome" and "proud" but also says "But so you miss that modest charm / Which is the surest charm of all." This shows the reader that Helen Grey is very attractive and takes pride in her attraction. However, she has let her beauty go to her head, resulting in an unpleasant personality that no man has found her attractive. The last four lines of the poem "Helen Grey" support the its main theme by drawing the reader's attention to the reality of age and time. Time will continue to go by causing Helen to grow old, wrinkly, and gray. Time will pass and with it, Helen's beauty shall pass too. If she does not change her ways, she will be left with and unattractive personality, and face.
This is most evidently a metaphor. The thing to keep in mind when analyzing literature/poetry is that if you see figurative language making comparisons/drawing parallels between two differing things--instances where the meaning is not literal such as how injustice is not really a fire and has no flames--it's a safe bet you'll have on your hands a metaphor.
Atlas was a giant who was forced to carry the Earth and the heavens on his back. An atlas is a book or collection of maps. Many atlases also contain facts and history about certain places.
