The passport photo should be saved as a .jpg between 600x600 and 1200x1200 dpi. It should be a 2x2 photo headshot, facing forward against a light colored backdrop. DO NOT SCAN YOUR ACTUAL PASSPORT! If you are scanning a photo to save as a .jpg, please make sure that it is cropped to just the 2x2 headshot.
Please note that a passport photo must be uploaded to each application, including applications for re-exam. If you are submitting a re-exam application you may use the same photo from the last application (providing that it is still representative) but it must be uploaded to the current application.