I had the same issue on my Droid. It looked like the "face" sprite was transparent, with the background camera image showing through this sprite, even when I set the scene's background color alpha to opaque.
I played with setting the "face" alpha to 1.0f (100% opaque) but nothing changed. I had success with setting the "face" sprite's alpha to almost-opaque, right after it is created, as below:
Not sure of the underlying reason for the sprite transparency effect in this case.