This paper proposes a concurrent schema using an extended Petri net. In general, Petri net offers a way to describe concurrency in processing, and detailed and complete representation of the picture painting system by Petri net can define exactly. But, using the standard way it lacks the brevity required to understand the behavior of the system. In order to remove these problems of Petri net, some extensions of Petri net such as to use multi tokens, multi arcs, and multi transitions are devised. Moreover, with the layered system, a set of layered, extended Petri nets provides a way that represents simply and visually the complex behavior of the painting system.