please watch together with the videos / pictures about the author of the pictures 弘一法師(李叔同)的學生 豐子愷的 "護生畫集" (cherish life )
That will help to have more understanding about the pictures and it s producing period .Because it is the promise of the author/student 豐子愷 to his teacher 李叔同(弘一法師) for awakening the people how to avoid suffering by cherishing life .