The phrase "Supermoon" should be taken out behind the shed and shot. And pictures like that middle one don't help.
So the moon appears very slightly larger. Big deal. Most people won't be able to tell the difference because there is nothing to compare it to.
Even this picture of an "average" moon compared to a "supermoon" doesn't help because in the real world, you won't be able to compare them to each other.
Oh, and according to wikipedia, the phrase "supermoon" came from the hippy astrologers from the 70s. It's not based in science. These are the same people who espoused pyramid power and the Bermuda Triangle.