Actually it was (art) for an answer
Behind part (Crossword homework: Weighty Matter)
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painting over what you already painted to make it look darker
You could make sculptures out of clay, mud, metal, etc.
Artistic Effets
Not a painting, but a drawing, called Vitruvian Man.
Of course he made drawings as a child. Painting is not the same as drawing!His first painting is from 1881 when he was 18.