Calligraphy four characters

The following idioms are all related to calligraphy: dragon and snake, swallowtail silkworm head, dragon and phoenix dance, force through paper back, crane knee and bee waist, dragon's agility, Yan Liu Jingu, iron painting silver hook, Toumu, Ding Zhen Cao Kai, writing sutras for geese, spitting jade and spitting silver hook. Except for the knee of a crane and the waist of a bee, everything else basically describes people.