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?