美国（United States）护照照片要求

In color
Printed on photo quality paper
2 x 2 inches (51 x 51 mm) in size
Sized such that the head is between 1 inch and 1 3/8 inches (between 25 and 35 mm) from the bottom of the chin to the top of the head. View the Photo Composition Template for more size requirement details.
Taken within the last 6 months to reflect your current appearance
Taken in front of a plain white or off-white background
Taken in full-face view directly facing the camera
With a neutral facial expression and both eyes open
Taken in clothing that you normally wear on a daily basis:
- Uniforms should not be worn in your photo, except religious clothing that is worn daily.
- Do not wear a hat or head covering that obscures the hair or hairline, unless worn daily for a religious purpose. Your full face must be visible, and the head covering must not cast any shadows on your face.
- Headphones, wireless hands-free devices or similar items are not acceptable in your photo.
- If you normally wear prescription glasses, a hearing device or similar articles, they may be worn for your photo.
- Dark glasses or non-prescription glasses with tinted lenses are not acceptable unless you need them for medical reasons (a medical certificate may be required)
- Glare on glasses is not acceptable in your photo. Glare can be avoided with a slight downward tilt of the glasses or by removing the glasses or by turning off the camera flash.

信息来源： https://travel.state.gov/content/travel/en/passports/requirements/photos.html