When I got my first drivers license (Germany) the photographer actually digitally removed some moles from my face and did other editing to make the picture appear more good looking. I was a bit baffled as the picture is supposed to identify me but didn't say anything. Since then I always take ID-pictures in a photo booth. It really doesn't need a professional to take an acceptable picture.

I could imagine a photo booth outputting a digital copy of the picture with signature so it is clear to the registration office that the picture has not been meddled with.