Let's take the photograph with doodled lens.
You doodle on your lens, then take a photograph. That's it.
You cannot erase a part of your doodling. If you doodle on your lens, you will be able to erase it? Anyway you can change to new lens (= clear all).
You should like this :)
Requirements: iOS 4.0 or later. Compatible with iPhone, iPad 2 Wi-Fi, iPad 2 Wi-Fi + 3G, iPad Wi-Fi (3rd generation), iPad Wi-Fi + Cellular (3rd...