Optical Illusions

Old Woman...Or Young Girl?
hint: the old woman's nose is the young girl's nose and chin

A Rabbit.... Or A Duck?
hint: the duck is looking left, the rabbit is looking right

Man Playing Horn... Or Woman Sillhouette?

Two Faces... Or One?
Woman In Vanity... Or Skull?
hint: move farther a bit from the screen and blink to see the skull or the woman (looking at the mirror)

Is The Book Looking Towards You... Or Away From You?