Johannes Vermeer's "Girl with a Pearl Earring" 1665) - "Certainly the way Vermeer captured subtle changes of light and focus seems to anticipate photography: some features appear in focus, while others seem out of focus, and objects are depicted with a foreshortening that resembles that seen in photographs -- this is perhaps one reason why he appeals to us today."
The painting Girl with a Pearl Earring (Dutch: Het Meisje met de Parel). circa 1665, oil on canvas, is one of Dutch painter Johannes Vermeer's masterworks and, as the name implies, uses a pearl earring for a focal point. Today the painting is kept in the Mauritshuis gallery in The Hague. It is sometimes referred to as "the Mona Lisa of the North" or "the Dutch Mona Lisa." Wikipedia.
Several sketches have been drawn by Leonardo Da Vinci that lead to a final painting, the Virgin and the Child with St. Anne. On this sketch of possibly St. Mary, Leonardo employed Sfumato (a technique to apply smoke for forms rather than edges to separate light and shadow). There’s no edge. It should disappear by blending same tone throughout. This also shows the master’s methodology of keeping his sketches in notes way before he was given a commission to work on a big project