I've two tips for miui camera: 1. Should include a "focus" zone somewhere in the "grid shot" option. It's a mess that need to focus and then enable grid. Can be a 1/4 of screen or even less. 2. Could have a preview mode of 1 second follow of an animation of the photo after taken, like a zoom-out to the preview, so u can see how was taken the photo. The actual Playback is a mess.