How can you get a nice blue lining color when painting gouache?

How can you make a good blue lining color when painting gouache? First of all, you need to know that the color of the blue lining is a cold tone, color to be richer you can take the blue as the main, usually the color of the lining is composed of the inherent color and the environment color, then if the lining around the warmer things such as red vase, painting the dark area of the lining you have to use the blue with a little ultramarine plus a little vermilion plus cream, reflections can be added to the environment color of the lining with a little green, etc., which is the influence of the environment color lining Subtle color changes occur, and the bright part of the lining of the area you can use light blue plus light yellow plus cream to improve the bright part of the lining, so that the painting of the lining of the dark and light is also a subtle change in the real before and after echoing the lining of the fabric will look very beautiful also painted the picture of the sense of space. You can do more color mixing exercises will naturally color mixing, oh, I wish you progress in your studies~