Some are much more sensitive to brightness and shadow.

Some will notice one kind of object in a view, or some detail in a face far more emphatically than others.

Girls are quicker to take note of the colour of eyes, hair, skin, clothes, and so forth than boys.

A woman who merely sees another woman for a moment will be able to describe her and her dress far more accurately than a man.

A man will be noticing other things.