If you’re testing an app that uses the Nokia Imaging SDK (or any other app that access your pictures library, for that matter) and you can’t see any content in your pictures library it might be the result of a bug in the emulator.
If you need to access the in-built images, you need to open the photos app at least once before you run your app. once you’ve done that, the content will become available to your app.
(Thanks to the guys at Nokia, this information has now been added into the documentation. I’m childishly pleased to have been able to help out in my own small way. )