Pleae someone help Identify the device used and discuss its effect on the meaning and tone of the poem.

Read the following Shakespearean sonnet.

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.;

I have seen roses damasked, red and white,

But no such roses see I in her cheeks;

And in some perfumes is there more delight

Than in the breath that from my mistress reeks.

I love to hear her speak, yet well I know

That music hath a far more pleasing sound;

I grant I never saw a goddess go;

My mistress when she walks treads on the ground.

And yet, by heaven, I think my love as rare

As any she belied with false compare.

The lines "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" employ a humor device.

The lines "I love to hear her speak, yet well I know / That music hath a far more pleasing sound; / I grant I never saw a goddess go; / My mistress when she walks treads on the ground" employ a humor device.