There are 9 people in the attached picture.
If you have noticed 6 of them,
your observation capabilities are on an average level.
If you have spotted 7 faces,
your visual perception is above middling rate.
If you are able to see 8 faces, you are very good!
You can be proud of yourself!
If you have managed to find all of the faces,
your perceptiveness is extremely good.
That means you have very strong intuition and you are a creative person,
you could even compete with Sherlock Holmes himself!