O.K. - but far from fully useful
The most serious deficiency is that you can NOT reduce the size of a photo to fit the passport template - you can only make it bigger. This is O.K. but leaves open the possibility of increasing the graininess and making the photo quality unacceptable. A good (easy?) fix would be to project the passport template on the screen when the photo is taken allowing the sizing to be done in the very first step. I would have made this suggestion to the developer directly but the "support" site does not allow for constructive comments - or any comments, actually. Bottom line - - with a little work you can get a decent passport photo but it is not as seamless as the app description makes it out to be. The same trial and error process can be used without spending $0.99.
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Passport Photo Booth