What is the central idea of the second quatrain? The speaker gives his mistress roses and perfume. The speaker’s mistress is like a rose—beautiful and fragrant. His mistress’s cheeks are not pink, and her breath is not sweet. Roses do not look and smell as sweet as the speaker’s mistress.

His mistress’s cheeks are not pink, and her breath is not sweet.

Explanation:

The second quatrain of Shakespeare's "Sonnet 130" speaks bemoans the features that his mistress does not have including how her cheeks are not pink and her breath is not sweet.

In the 6th line he states, But no such roses see I in her cheeks. Pinkish cheeks have been known to be held as a standard of beauty and in saying that his mistress had no roses in her cheeks, he infers that her cheeks are not pink.

And in the 8th line, he states that Than in the breath that from my mistress reeks.  Here he is saying that he prefers the smell of some perfumes because the breath from his mistress reeks which is an extreme form of saying that it is not sweet and is a  smell not unlike the smell of Theon Greyjoy in Game of Thrones which prompted Ramsey Bolton to start calling him Reek.

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