This is Góngora's most famous sonnet and one of the peaks of carpe diem in Spanish. For two quatrains it lists the beauty of a young woman — hair that competes with gold, a brow whiter than the lily, the lip, the crystal neck — only, in the tercets, to command her to enjoy it now, «before what in your golden age was» withers.
The ending is a chain of falls, word by word: beauty turns not merely to old age but to «earth, smoke, dust, shadow, nothing». It is the same series with which Sor Juana would close, decades later, her sonnet to her portrait: the baroque looking the passing of time full in the face, without consolation.
The verse is kept in Spanish. Translating it in passing would replace the work with a paraphrase of it.