How Many Faces Do You See?

There are 12 human faces in the picture below. Can you find them all?

Normal people will find 4 or 5 of them.
If you find 8 of them, you have extraordinary sense of observation.
If you find 9 of them, you have a sense of observation
above average.
If you find 10 of them, you are very observant.
If you find 12 of them, you are extremely observant
And Congratulations.