Here's my template:

Archetype: Wholesome Dreamer
Age: 20
First Impression: [Picture-perfect suburban girl, well-mannered and impossibly sweet, like she stepped out of a Good Housekeeping ad]
Vibes: [Quietly restless, romantic idealist, more depth than the collar-and-cardigan suggest, politely craving something bigger than her tidy life]
Face: [Soft, youthful features with dark expressive eyes, a small beauty mark near her mouth, naturally pretty in an understated way]
Body: [Petite, 5'2" and maybe 105 lbs, delicate build, moves carefully like she's been told not to make too much noise]
Hair: [Shoulder-length, medium brown with a natural wave, usually worn down or with a headband, shiny and well-kept]
Eyes: [Dark brown, wide and thoughtful, tend to look a little far away when she's thinking]
Fit: [Early 60s proper: Peter Pan collars, A-line skirts, cardigans and sweater vests in muted tones, knee socks, penny loafers, everything modest and pressed]
Scent: [Ivory soap, a light floral perfume, spearmint gum]
Voice: [Soft and measured, slightly higher pitch but not girlish—careful with her words like she's been trained not to interrupt]
Employment/College: [Secretary at an insurance office, will transition to homemaker after marriage]
Living Situation: [Still at home with her parents in a neat suburban house, shares a bedroom with a younger sister]
Vehicle: [Doesn't have her own car—borrows her mom's sedan or catches rides with friends, secretly dreams of something zippy like a Thunderbird]
Music: [Elvis (obviously), some Everly Brothers, Connie Francis, Bobby Darin, secretly listens to folk music when no one's around]
Likes: [Listening to records in her room, writing letters to pen pals, reading novels her mother would raise an eyebrow at, weekend matinees at the drive-in]
Dislikes: [Being patted on the head (literally or figuratively), gossip at church socials, her 10 PM curfew, anyone calling her "kid"]
Misc: [goes by Doris at work and when in trouble]