Show a quick visual feedback that the picture has been taken

Currently, the only feedback that we have that the photo has been mechanically taken taken (the shutter is now closed) is the small preview that is taking a few seconds to load. It would be nice to have a visual feedback that the photo has been taken so one can know when they can safely move the camera.

This could be with the screen going black while the shutter is open and the preview appearing quicker, before the picture is fully processed.