Let's face it: when a woman's pregnant, her looks change. That's just a fact of life. And it's this fact that Plath chooses to hone in on her pregnancy poem, "Metaphors." The visual imagery describing the new look of the pregnant speaker just goes to show that when you're with child, the world looks at you differently. And for Plath, that's not a good thing.
The imagery in this poem shows us that even when pregnant, a woman's appearance is prized over anything else.
This poem shows how the changes in appearance caused by being pregnant can affect women negatively.