Not everyone can see it correctly

Not everyone can figure it out right.
Optical illusions are famous for being puzzling and for testing our eyesight. Right now, there’s a really special one going around on the internet. Even though it’s one of the simpler illusions, it’s still confusing most people who look at it.
Optical illusions come in various types. Some make you find a mistake, and others hide the answer right in front of you. This one is more like the second type. It tests how sensitive you are to contrasting colors.
At first look, it seems easy. But the more you stare at it, the more you might notice. Still, in the end, the real answer is leaving most viewers confused.

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The Answer is =>>> There are 7 faces in the picture.