To me, a great poem is a poem that will stand out, that refuses to conform, many great poems are stretched over a vast array of topics, from statues to death, but their reason for being great is never the same. What makes many poems great is their vivid use of creative language, be it old or new. Poems are great by their use of creative rhymes that give the poem not only meaning, but lines that your brain is forced to remember as well.
One element that makes "She Walks in Beauty" a great poem is that it uses a constant barrage of metaphors leading the reader to fall onto the authors path of thought, clearly explaining his thoughts and his indestructible and eternal thoughts preserved by his famous words. An example of this is "...Like the night of cloudless clime and starry skies.." This line is a metaphor transferring Lord Byron's thought that the woman he is describing in this poem is as calm and as clear as the night sky.
Another factor that makes this poem great is Lord Byron's use of imagery. This factor makes the poem great because it helps to transfer Lord Byron's vision to the readers. An example of imagery in "She Walks in Beauty" is "Which waves in every raven tress or softly lightens o'er her face" This line is from a paragraph describing that the woman he is speaking of is elegant in all manners and all places.
A final contributing factor to this poems greatness is its use of colorful, creative and innovative word choice, a vital to any poem of other form of spoken word. Some of them are: serenely, mellow'd, climes and tender. When compiled with the previously listed factors of greatness, the entire poem falls together as it seems it was meant to be.
In conclusion, to me these are just a few of the reasons that this poem is great and will be remembered for many more years. This poem is one of a kind and many poems are great for the same reasons but no poem is the same as another. This poem is great for not its authors ability to use the elements of poem greatness but the poems ability to reach out, connect and be remembered by readers.