In this video, author and illustrator Will Hillenbrand shares his thought process on creating the illustrations for the book "Zee Grows a Tree." He emphasizes the importance of considering the narrative and the overall movement and flow of the story when designing the illustrations. Hillenbrand also discusses the use of color, texture, and page composition to enhance the visual storytelling and engage the reader. The video provides valuable insights into the creative considerations and techniques employed by a skilled children's book illustrator.