Review your photos before attaching them to the passport application. The U.S. Department of State is strict on passport photo requirements. Make sure the photos measure exactly 2-by-2 inches, are identical and display an unobstructed view of your face.
Attach 1 photo to the photo square on your passport application. Place it upright, lining up the 4 corners of the photo with the box. Staple the edges of the photo vertically, on all four corners.
Place your application in a large, sturdy envelope; do not allow the application to bend. Slip the second passport photograph in the envelope. Do not attach the second photo to the application.
Mail your completed application packet, or bring it to the nearest passport service center for processing.