How to straighten the sketch line?

Find the right fulcrum, practice more and draw straight.

The practice of lines is in two aspects:

1, drawing (long) line, its function and use is the line used in drawing and large shape. Generally, in order to make the line long and straight, it is easier to correct and adjust the accuracy of the line with bidirectional lines. Point type can't draw a line with the prefix "D", that is, you can't draw a line on paper for fear that the canvas is straight, but draw the movement track of the pendulum. This line is light at both ends and heavy in the middle. When practicing, you can draw a point first, and then practice 360-degree drawing through this point.

2. The flat cable is used to control the lines well when coloring, so as to show the texture of the object well. The ribbon cable should also be like the trajectory of a pendulum. The surface formed by the discharged lines should be able to well control the color and spacing changes of the surface, including the paint surface with uniform or uneven spacing, and the color control should be uniform or orderly, otherwise the paint surface will be chaotic.