Isolate an area in your store that has a white or off-white background, or use a white screen to act as a background to take passport photos.
Place a tripod for the camera at least four feet away from the area where the subject will stand to take the photo.
Practice taking close photos that display a person's full head from the top of the hair to the bottom of his chin, with the subject facing the camera. The head must be centered in the frame, the height of the head must measure between 1 and 1 3/8 inches, and the height from the top of the eyes to the bottom of the photo should measure between 1 1/8 inches and 1 3/8 inches.
Practice cropping the digital photos to measure a total of 2-by-2 inches, and use a ruler to ensure you have met all the other required measurements stated in Step 5.
Place an advertisement in your store window that states you take official passport photos.