Children's Book Cover Redesign

I need to redesign the cover illustrations for five children's books aimed at students in grades 1 to 5. The new covers should be colorful, engaging, age-appropriate, and visually reflect the subject or theme of each book. Each cover must appeal to young learners and encourage interest in reading.

Themes: Fantasy and Adventure; Science and Technology
Illustration Style: Realistic and Detailed

Ideal Skills and Experience:
- Strong portfolio in children's book illustrations
- Expertise in realistic and detailed art styles
- Ability to create engaging and age-appropriate designs
- Experience with fantasy and adventure, as well as science and technology themes

Please provide samples of similar work.