In this poem, she uses metaphors to express her frustration with the imperfections she sees in her work, but also defends its value and her intentions.
Here's a snippet from the poem that highlights this sentiment:
> "I had rather that my Book should be
> Still as it is, than by thy art
> To be presented in the best array,
> And thy endeavors make it fine and gay.
> For if thou think'st it good, it is not so;
> And if thou think'st it bad, thou art in error too."