EDIT
alexyak/camera module is not built for displaying taken photos on MM screen.
Of course, you can modify it. When the module gets SEND_EMAIL socketNotification from node_helper, the payload will contain dataUrl. I think it might be the url or path of photo taken by this module. Now you can create code for displaying photo on screen with that value.
I’m seeing inside of that module, and I’ve found it has the feature selfie snapshot already. If that module works properly, taken photo will be shown on MM screen. If not so, your module has a problem or not be activated.