One outfit, in-studio, fifteen minutes. 

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Passport Photo Requirements Per US Travel Website

https://travel.state.gov/content/travel/en/passports/how-apply/photos.html

You must provide one photo with your passport application.

All photo policies apply to both adults and children under age 16. We have a few exceptions to our photo policies for infants.

1. Submit a color photo, taken in the last 6 months
2. Use a clear image of your face. Do not use filters commonly used on social media.
3. Have someone else take your photo. No selfies.
4. Take off your eyeglasses for your photo.
5. Use a plain white or off-white background.