Done in different techniques, they can be classified as pencil sketches, pencil drawings, coloured pencil drawings, monochrome watercolours, ink drawings and coloured ink drawings.
英
美
- 形式技法方面,有铅笔速写、铅笔素描、铅笔淡彩、单色水彩和毛笔水墨、毛笔设色几种。