Heres from the FAQ :
"Three (3) recent photos (4.5 cm x 3.5 cm), ROYAL BLUE BACKGROUND, taken in a photo studio or professionally taken within the last six months before application."
But I think, you don't need a photo anymore :
"Note: Since May 17, 2010, the XXXXXX Consulate General in San Francisco implemented the processing of the e-passport. The e-passport contains an integrated chip, the latest technology in travel documents, which will increase the integrity and security of the XXXXXXX passport. All XXXXXX citizens applying in San Francisco no longer have to submit photographs, as pictures and finger prints will be taken on-site--the costs of which are already included in the application fee of sixty US dollars (US$60) for the e-passports."
My passport will be expiring, I can drive to San Francisco bringing other requirements except photos.