When you start painting, you should choose simple materials, such as Inuyasha, One Piece, Naruto, Conan and so on. You should choose the simplest person to copy, and be patient. After selecting a person, only draw him until one of his paintings is rarely modified, and no more broken lines are used (for example, the outline of the face is drawn with lines instead of thin lines). When you make a copy,
Remember: not quantity, but quality.
If you have completely mastered all the expressions and actions of this cartoon character, then you can get started. Then when you draw some characters, it is very simple, because the expressions and actions of the characters in the animation are almost unique. Once you master all the characters, you don't have to worry about the expressions and actions of other characters in the future. As long as you change your hair style, clothes and colors, you can basically draw all the anime characters.
Pay special attention to the facial features of men and women in animation. For example, girls' eyes are as big as eggs (forgive my metaphor), and boys' eyes are as slender as foxes (continue to forgive me). Girls' facial contours are soft, while boys' facial contours are hard (some painters draw the same facial contours of men and women, which does not affect the painted works, as long as they look good), so it is not very important to observe carefully when copying, but it is important to copy them like.
Finally, no one can eat a fat man in one bite, so as long as you are willing to practice, one day you will paint to make everyone doubt that your painting is genuine, and then you will really succeed.
Of course, as long as you do the above, you can stop copying and create your own.