From the book "Martine, petit rat de l'opéra" by Marcel Marlier & Gilbert Delahaye; or, as I knew it, "Anita no ballet". I remember propping this up on a music stand and doing the positions in my bedroom.
This is a good photograph because it is taken from an interesting angle and is not a typical dancer picture. The pointe shoe coming towards the camera creates a sense of depth. and I like the tutu thing