There are books, but they are mixed. You'd better go to the bookstore and see for yourself what meets your needs. Although it seems that this kind of stick figure does not need in-depth study, in fact, some basic composition knowledge (proportion, perspective, etc. ) you should know, otherwise the proportion of creation may be uncoordinated, and more practice is needed. It will take some time from copying to creation. Come on ~ O(∩_∩)O~