The reason why Huang Quan made a mistake in this painting and calligraphy bird is because.

Yellow observation of things is not careful enough, and yellow knowledge is insufficient.

1, Huang Quan's observation of things is not detailed enough: Shu Huangquan lacks understanding of the characteristics and dynamics of birds, and cannot accurately capture and express the shape and expression of birds.

2. Lack of knowledge of Huang Quan: In order to maintain balance, Shu Huangquan did not deeply understand the truth that "birds shrink their necks to show their feet and neck to show their necks", so they failed to accurately show the balance of birds when drawing birds.