The artfulness of the painting lies in its ability to express complex emotions with simple strokes.

artfulness 是由名词 art（艺术）加上后缀 -ful（充满...的）构成形容词 artful（巧妙的、有技巧的），再加上后缀 -ness 构成抽象名词，表示"巧妙、技巧性"的品质或状态。