You have a fixed lens and as far as I am aware, the only way to change perspective is to vary the distance. Hwever. I've just seen the following elsewhere --
Composing great shots just got easier with Apple’s upgraded Camera app, which now uses the volume button to act as an added shutter button (though your finger might get in the way of the lens on the iPad). Gridlines can help you compose better shots. With pinch-to-zoom, photographers can quickly zero in on one part of a shot with autofocus on, then adjust for exposure and click.
With the enhanced Photo app, you can make your pics frame-worthy with new features such asred-eye removal. After you have taken the perfect shot, you can save it to Photo Stream, iOS 5s new photo service. Photo Stream uploads all your photos to iCloud, where they can be pushed to up to five iOS devices.
One problem I have noticed is that if you have light above, then the overall image may seem to have a cast over it. Try shielding the lens from 'direct' light with your hand, but be careful not to get it in the frame. Editing by croping the image can define final results.
Alex