Cartoonish Children's Book Illustration

I need an illustrator to create cartoonish illustrations for a children's book aimed at 4-7-year-olds. I have specific characters already designed, so the focus will be on bringing these characters to life in a fun and engaging way.

Key Requirements:
- Create cartoonish illustrations suitable for children aged 3-7.
- Use existing character designs provided by me. I have uploaded three samples I created on chat gbt but I couldn't get it to stay consistent the first picture of Willie the worm is pretty close to what I wanted but the first story is Willie gets a haircut so I wanted him to have long hair with bangs half in his eyes and I couldn't get AI to do it and then I wanted the barber to be a beetle about the same size as the original Barber. Could not get it to stay consistent

Ideal Skills and Experience:
- Experience in illustrating children's books, particularly for the 4-7 age group.
- Strong ability to create engaging and vibrant cartoonish illustrations.
- Familiarity with working from existing character designs.