As I wrote in M91:
main page with recent shots, with a FAB buttons to take a new one. When you push the FAB a new page is opened with the video-input from the webcam and a new FAB to take the photo. When the photo is taken it appers in the first page with the others.
If you tap on a taken photo in the list a new page is opened with that photo and the context menu has options for that photo.
The global drawer is always the same and has actions that have sense in every moment, like "open Settings page".