The US passport photo is only a 2x2" print. The passport office DOES have head size requirements, background requirements, and eyeglass requirements (none allowed), but they just don't seem to have any QUALITY requirements.
If they did, then drug stores, auto clubs, and post offices likely wouldn't bother with them.
Every time someone walks into my studio with a pair of blurry, underexposed, off center, greenish passport photos and screams "HEEEELLLLP!" I know what has happened.
I highly encourage people to seek out Tampa's Best Passport Photographer before venturing into the path of point and shoot held by someone who can't tell you the difference between an aperture and an FStop.
I don't sell toothpaste. I sell photographs. And passport photographs are with you for TEN YEARS! Do it right. Call Newsome's Studio at 813-968-2810 and schedule a ten minute appointment today.