Start with high-confidence painting for kids books, then narrow by subgenre or adjacent topics.
The Noisy Paint Box: the Colors and Sounds of Kandinsky's Abstract Art
Barb Rosenstock
Paint by Sticker Kids: Unicorns & Magic
Workman Publishing
Pocket Full of Colors
Amy Guglielmo, Jacqueline Tourville
ABCs of Art
Sabrina Hahn
123s of Art
How to Be a Color Wizard: Forage and Experiment With Natural Art Making
Jason Logan
The Renaissance Artists
Diane C. Taylor
Super Simple Sumi-e
Yvonne Palka
Summer Magic Painting Book
Lizzie Cope, Marcella Grassi
Big Book of Colors
Felicity Brooks, Sophia Touliatou
Narwhals and Other Sea Creatures Magic Painting Book
Sam Taplin, Elzbieta Jarzabek
Latin American Art
Kimberly Lane
Wall to Wall
Mary Ann Fraser
Frida Kahlo's Flower Crown
Nydia Armendia-Sánchez
13 Paintings Children Should Know
Angela Wenzel
13 Art Techniques Children Should Know