The iPhone camera is one of the weakest parts of the package. There are however a number of apps that try to improve upon the crappy camera and what it is capable of. One of those is Camerabag, which I’ve downloaded and I have to say, it can make a difference in the output.
That said, here’s a story of how Artist Joel Murphy used the iPhone camera and Camerabag to submit a grant application. Apparently he couldn’t get the right picture with real camera but the combo mentioned above did the trick.