The earnings of a children’s book illustrator can vary significantly based on factors such as experience, the complexity of the work, the publishing method (traditional vs. self-publishing), and the specifics of the contract. Here are some general guidelines.

Factors Influencing Earnings
Experience and Reputation Established illustrators with a strong portfolio and reputation can command higher rates.
Project Scope: The length and complexity of the book, including the number of illustrations and the level of detail required.
Publisher Type: Traditional publishing houses often have set rates, while self-published authors might negotiate directly.
Rights and Royalties: Some illustrators might receive royalties on book sales, while others work for a flat fee.
Location: Geographic location can influence rates due to cost of living and demand in different regions.

Typical Earnings
Flat Fees
Beginners: $1,000 to $5,000 per book.
Mid-Level: $5,000 to $10,000 per book.
Experienced/Established: $10,000 to $30,000+ per book.

Royalties
Percentage: Illustrators might receive 1% to 10% of the book’s net sales, depending on the contract.
Advances: Some publishers offer advances against future royalties, ranging from $1,000 to $10,000 or more.
Hourly Rates
Beginners: $25 to $50 per hour.
Mid-Level: $50 to $100 per hour.
Experienced/Established: $100 to $250+ per hour.
Additional Income Streams
Workshops and Courses: Teaching illustration techniques.
Licensing Art: For merchandise, prints, or other media.
Freelance Projects: Illustrating for magazines, advertising, or other publications.
Conclusion
Children’s book illustrators’ earnings vary widely based on their career stage, the nature of their projects, and the specifics of their contracts. While beginners might start with lower fees, building a reputation and a robust portfolio can lead to higher earnings and more lucrative opportunities over time.