Good idea, but a bit expensive
I haven't made use of any certified photos yet, so I'm only commenting on superficial elements.
I like the idea of this and I can see it being extremely useful. The interface is pretty simple, which is definitely a good thing in an app like this. It would be nice if a few additional features were added to the camera function, but that's really not necessary.
My biggest realization is that the cost of certified photos is pretty over the top. These guys are just recording individual photos and storing them on a server with the promise that they won't lose them, change them, or give them away without permission. They should offer pictures at 25 cents per picture for small packs and less than 10 cents for large packs. Maybe that pricing would be optimistic, but a $1.20 per photo in packs of 5 is kind of extortion too.