Children should be exposed to art when they are young. Art can be used for play time activities and at any time during a child's development. Although schools are primarily focused on children passing standardized tests, I hope that they will not neglect the Arts. Our children need them.
In book 3, you will see the development of artistic style. You will also see that it is not just one particular style, but that it is an ongoing experimentation with several drawing styles. Enjoy perusing these pages and start developing your own style. Enjoy!