Animation is often known as anime as an easier way to term it. The phrase was born from animation artwork from Japan such as cartoons or comics. However, it is now more often than not used with cartoons from the country.
An anime artist can make use of different styles and methods to design each series. While every individual has his or her own artistic preferences, it also shows that there is no fixed method to achieve this for any designer. It basically boils down to what works best for the anime designer.
There are many ways one can use to come up with his or her own anime series. It will usually depend on personal preferences and specific idiosyncracies. There is no right or wrong way to do it, just the best way for each individual artist.
Manga
