Poetry Discussion Question In Shakespeare’s “My Mistress’ eyes…,”, English homework help

In Shakespeare’s “My Mistress’ eyes…,” what is the simile in the title? Second, it seems that Shakespeare is saying some rather unseemly things about his mistress. What are two or three of those unsavory comments that he makes about her?

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.