You have to ensure your camera is already in selfie facing. Setting camera to enable timer say 2 secs. Also shooting method, choose TAP SCREEN. Ok you are ready

App downloads - Google Photos Get the Google Photos app to back up and view photos on your Android and iOS devices. Google apps. Press question mark to see available shortcut keys. Sign in. Photos. Back up a lifetime of photos. Backup and Sync. Automatically back up photos from your Mac or PC, connected cameras and SD cards Amazon.com: Ok Google AMORTEK Outlet Wall Mount Holder for Google Home Mini, A Space-Saving Accessories for Google Home Mini Voice Assistant (White) 4.5 out of 5 stars 2,795 $7.99 $ 7 . 99 $10.99 $10.99 Open Camera - Apps on Google Play

A better look at the update’s new features. Yesterday, the search giant released a blog post on Google+ offering more details about this new feature: “With the Google Search App on Android, you can just tap the microphone or say ‘OK Google,’ then ‘take a photo’ or ‘take a video.’ Google Inc (NASDAQ:GOOG) will launch your camera app in the preferred mode.”

Nov 12, 2019 OK Google, "Take A Photo"

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Mar 20, 2014 Take a photo on your Pixel phone - Google Camera Help Say, 'Ok Google, take a picture' or 'Ok Google, take a selfie'. Optional: Get the camera to wait before taking the photo. For example, 'Ok Google, take a picture in 12 seconds'. You can tell the camera to wait 3–30 seconds. Your Camera app will open and take a photo. How to use Ok Google to take a selfie in android device