In recent six years, the study of human dynamics has experienced a flourishing development. In order to verify and explore the universal human dynamics rules of artist creations, a statistical investigation on the creations of three famous artists (Xu Beihong, Feng Zikai, Liu Haisu) is performed. The results show that their interevent time distributions obey the power law as in a qualitative agreement with the known human dynamics rules in communication, visit to networks, borrowing books and order programme of movie or music. The power law exponents of the three artist interevent time distributions are exactly the same. The value is 2.14, largely deviated from those of scientist and writer interevent time distributions in literature, which indicates that while the artist creation activities do obey the universal rules of human behaviors, they have their own characteristics. It is proposed to use the so-called "enveloping curve" of the data, including the number of the works an artist created in a year, as well as the shape and the number of the creation fastigiums, in an enveloping curve form, to describe the differences of artist individual creation rules due to their personal experience. An enveloping curve is defined as a smooth curve nearest to all "higher points", to which each oscillation of the work number an artist created in a year reaches during a rising or falling process of the creation. In principle, this statistical description suits the studies of other human behaviors.