Hangzhou Yuanxiang Art Studio www.hlstu.com.cn The so-called "rapid" completion refers to the sketch assignment finished within about 3 hours. This is for Hangzhou art training in preparation for the sketch exam, as the sketch test time is usually limited to 3-4 hours. Normally, we would need at least dozens of hours to finish a plaster head sketch. Therefore, to complete the sketch assignment well in a short time, it is necessary to use some special methods and compress the painting steps.