Two: the standard of brushwork is richness, hiding and revealing, square and circle, point and line, slow and urgent, and so on. The ancients said: the center has a skeleton, and the flank sees the spirit. Blindly Fang Bi or blindly round pen, the same speed, are monotonous, will affect the perception, which is called no pen, no pen.
Three: See the picture below.
Four: Russian realistic painter.
Five: Spanish realistic painter.
Six: French romantic painter.
Seven: Leonardo da Vinci, Michelangelo, Raphael
Eight: Dunhuang Mogao Grottoes, Yungang Grottoes, Longmen Grottoes and Maijishan Grottoes.
Nine: Three primary colors: red, yellow and blue, and three primary colors: green, purple and orange.
Ten: painter Xu Wei in the late Ming Dynasty