I'm going off the descriptions given in Rick Riordan's books, specifically "Percy Jackson's Greek Gods".
HERA [ priyankachopra ]
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"even as a baby, Hera was the most beautiful daughter of Kronos and Rhea. When she reached maturity, she was viewed as the most beautiful goddess in all creation, with long licorice-black hair, a face of regal and unapproachable beauty like that of a supermodel on a fashion runway, and large, soft brown eyes that one could get lost in."
DEMETER [ katherine heigl ]
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"Demeter is more beautiful than Hestia, though less so compared to Hera: she had long blond hair the color of ripe wheat, and wore a bright green dress with a dark cape, which gave her the appearance of fresh plant shoots breaking through fertile earth whenever she moved."
HESTIA [ kat graham ]
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"even as a baby, Hestia was beautiful and perfectly proportioned, with eyes that were too intelligent for a newborn, and she radiated power. As a mature goddess, she was sweet-looking and beautiful in an unpretentious way, with an honest smile, warm brown eyes, and black hair that framed her face in ringlets."
APHRODITE [ youridealbeauty ]
"As the personification of beauty, Aphrodite's true appearance is actually unknown as she would appear to others as their personal epitome of physical attraction."
Some Ideas: Lupita Nyong'o, Brenda Schad, Adriana Lima, Rosie Huntington-Whiteley
ATHENA [ evagreen ]
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"Athena made her first appearance as a park ranger, with long black hair, pulled back in a ponytail and tinted glasses. When she took off her glasses, Percy saw that she had startlingly grey eyes, like storm clouds. Later on, when Percy arrived on Olympus, Athena was described as a beautiful grey-eyed woman in an elegant white dress, and he immediately recognized her as Annabeth's mother. During their conversation, Percy again noted the resemblance between Athena and Annabeth, to the extent where he almost addressed Athena as Annabeth, and also realized through her cold grey stare that she would make a terrible enemy."
ARTEMIS [ marieavgeropoulos ]
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""Percy Jackson's Greek Gods" describes Artemis as an extremely beautiful goddess, lovelier than all her attendants, being tall and well-built body. She has shoulder-length raven-black hair, and striking silver-grey eyes that could easily intimidate when she was angry."
HECATE [ katiemcgrath ]
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"Her dark hair barely came down to her shoulders. There is a green shimmer that surrounds her like an aura. Her face is like a Greek statue — pale, beautiful, and ageless."
PERSEPHONE [ sarah gadon ]
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"Persephone was described to be an incredibly beautiful young goddess (enough to attract the attention of Hades, who hardly ever left the Underworld) with her mother's long blonde hair and her father's sky-blue eyes. She was so beautiful in fact, that Adonis had trouble choosing between her and Aphrodite."
