In my previous post Striking a Balance I introduced some of my favorite watercolor books, including “Vibrant Flowers in Watercolor” by Soon Y. Warren as well as a free online demo from the book made available by the publisher. Here is another free online demo from the book that shows you how to use complimentary colors when painting objects from nature arranged against a background with a complimentary color.
Free Download: Soon Y. Warren on Using Complementary Colors