Optical illusion

Look Extraordinary Optical illusion at

http://www.wonderfulinfo.com/illusions/pg017.htm
There are 11 human faces in the picture. Can you find them all?

Normal people find 5 or 6 of them.
If you find 8 or 9, you have a good sense of observation.
If you find 10, you are very observer.
If you find 11, you are extremely observer.