EXPLANATION 

"My mistress' eyes are nothing like the sun,

Coral is far more red than her lips' red

If snow be white, why then her breasts are dun

If hairs be wires, black wires grow on her head."- 

Ans:- In the Sonnet 130 the poet celebrates the beauty of his beloved which is a reversal of the conventional beauty of mistresses of the Elizabethan poets.The poet praises his beloved, but each adjective in that praise is preceded by a negative. Her eyes are not bright like the sun, her lips are not red like the coral, her breasts are not white like snow, her breasts  are dull brown. If her hairs are compared to wires, wires are not golden but dark.

The poet admits that his beloved is not a paragon of beauty. The Elizabethan poets adore their beloveds in the conventional stereotyped manner. The poet stresses her naturalness' as contrasted with the artificiality of the beauty of the other mistresses. The poet is satirising the conventional descriptions of the beauty of the mistresses by the sonneteers.