Find My Face uses all the photos you are already tagged in to create a model of your face and when a friend is looking at picture of you, it suggests to tag you. This feature is disabled by default, but if you have enabled it and want to turn off Find My Face on your Google+ account via an Android device, do as follows:
1. Open Google+ and go to settings (You can also open Google Settings application and then select Google+)
2. Tap Photos
3. Make sure Find My Face is unchecked.