This work is a hand-painted industrial design renderings training work by Yixiang, which mainly improves the expression skills of markers. Mark pen is the key ability to express industrial design and take part in the postgraduate entrance examination of industrial design. Whether it is the requirement of brushstroke, the control of virtual reality or the mastery of color, it is very high. If you are interested in these works, you can also log in to the BILIBILI account of Yixiang Design Art Center with full HD video on it. Yixiang Design Art Center is the first batch of industrial design education institutions in China, established in 2004. For more than ten years, a very systematic tutoring system has been accumulated, covering hand-painted tutoring, software tutoring, postgraduate entrance examination tutoring, overseas study tutoring, ability improvement and other fields.