You can still defeat this pretty easily by using a video instead of a photo, I was able to unlock my Nexus 7 by recording a video of me blinking with my Galaxy Nexus and then playing it back.
Reshared post from +Robert Cooper
HA!
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Android Jelly Bean Face Unlock has new Blink requirement, works faster [VIDEO]
Face Unlock launched with a bit of controversy and skepticism because it was easy to game the system. A person could hold up a picture of the device owner and unlock the phone because the unlock screen required only that a facial match be detected. In Android 4.1 Jelly Bean, Face Unlock ups the ante with a “Liveness check” feature.
Jelly Bean has an optional security feature that adds an extra layer of security for face unlock. When someone sets the phone to enable “Liveness check,” the phone…