The poem is a blazon because THE POET COMPARES HER LOVE TO BEAUTIFUL THINGS IN NATURE.
In literature, the blazon refers to a poem that list series of physical attributes of a person or character. Most of the time, the character is usually a female. This type of poem was used freely during the Elizabethan period. This type of poem always compares the body parts of a subject to other things such as jewels, celestial body, natural phenomenon, etc.
