The first step in drawing a sketch is to practice drawing shapes. How to draw a good shape, what are the methods and techniques?
Start with a large shape, such as whether the object is a long circle or a square. Then set four points on the paper, namely: high point, location, left and right points, and then draw the center line for easy comparison.
For example, if we draw a circle directly, it may not be easy to draw a standard, but first draw a square, then cut off the four corners, then cut off the eight corners, and then it will eventually get a very standard circle.