Marin is the only character who isn't constrained by her beauty.
In "The House of Mango Street" we can see how beauty is something complex, and desired, which can be seen as a blessing and a curse. That's because while beauty is something that everyone wants, women who have it are restricted and abused by it.
This happens with Sally and Rafaela who are beautiful and oppressed, abused and disrespected for it. Beauty also overwhelms Esperanza and leaves her in a fragile situation.
Marin, on the other hand, uses her beauty to sell her cosmetics and help with household expenses, but she suffers from other types of restrictions.
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