The Secrets of Coloring 2: Step-By-Step Tutorials and Tricks of the Trade from a Professional Illustrator

The Secrets of Coloring 2: Step-by-Step Tutorials and Tricks of the Trade from a Professional Illustrator (Volume 2) (The Secrets of Coloring Series)

The Secrets of Coloring: Tutorials and Tricks of the Trade from a Professional Illustrator

Colorist's Special Effects 4: Achievable colored drawing skills!