Picture books allow an entirely different, more interactive communication between parent and child. All those nails have been hit.
For me, it led to a few projects but it also has led to me at the current day questioning what is my next step as an illustrator. Picture books help develop story sense.
Seuss still sell, publishers have scaled back the number of titles. It seems to have resounded well, with many fans staying along and enjoying the work, and creating their own in response. The illustrations of a picture book help children understand what they are reading and allow young readers to analyze the story.
I don't think it is fair to give out information that would 'spoil' the reader's enjoyment of the story.