The Golden Ratio in Art

There is a mysterious number 1.61803 in these art works!

Annunciation, Leonardo da Vinci, Around 1472, From the collection of: Uffizi Gallery
Find the relationship between the width of the woman on the right side and the door behind her.
Doni 'Tondo', Michelangelo Buonarroti, 1506 - 1508, From the collection of: Uffizi Gallery
Find the Golden Star in this picture. Hint: the positions of characters.
Christ and the woman of Samaria, Ascribed to Michelangelo, Between 1536 and 1542, From the collection of: Walker Art Gallery, Liverpool
Find the golden ratio in this picture.
Portrait of the Young Cardinal Ippolito I d'Este, Raphael, 1503–1505, From the collection of: Museum of Fine Arts, Budapest
According to the golden ratio on Mona Lisa's face, find the same ratio on this man's face.
The Channel of Gravelines, Petit Fort Philippe, Seurat, Georges, 1890, From the collection of: Indianapolis Museum of Art at Newfields
Find the Golden rectangle in this picture. Hint: the height of sky.
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