Number of photos: only 1 passport photo is required, even if you are applying for both passport book and passport card.
Photo size: The photo must be 2 inches by 2 inches (51mm x 51mm).
Photo quality: The photo must be clear, with a high resolution, and in color.
Facial expression: The photo must show a neutral facial expression or a natural smile, with both eyes open and looking directly at the camera.
Clothing: You should wear normal attire. Do not wear a Uniform. Do not wear a hat, glasses or head covering unless worn daily for a religious purpose. Your full face must be visible.
Background: The background should be white or off-white, and without any shadows.
Head size: Your head should be between 1 inch and 1 3/8 inches (between 25mm and 35mm) from the bottom of your chin to the top of your head.
Printing: The photo should be printed on matte or glossy photo quality paper.
Other requirements: The photo should not be older than 6 months. The photo can not be edited.
It's important to ensure that your passport photo meets all of the above requirements to avoid delays or rejection of your passport application.