素描入门难度最大的就是观察方法的更新；其次是表现方法的应用．人的绘画习惯是局部描绘法：看一个地方或一个物体就画一个地方或一个物体，有些地方完了，调子画过了，还有一些地方没有动一笔，其结果是：时间花的越多，画面效果越差．一组白色的石膏几何体，常常画成亮部是 Sketch entry is the most difficult to observe the update method; followed by the application of performance methods. Human painting habit is a local painting method: to see a place or an object to draw a place or an object, some places are finished, tone painted, there are some places did not move a pen, the result is: the more time spent , The worse the picture effect. A group of white gypsum geometry, often painted bright part is