It's a very interesting topic, Sue!! You can study color all your life and still have things to learn! When I was teaching myself oil painting I read a number of books on color theory which is, of course, useful to know, but we all have our own favorite colors. Working outside that preference can be challenging, but also rewarding! In painting, whenever someone is struggling to capture some detail experienced painters tell them to alter how they are looking. Sometimes that can be done by turning a painting on its side or painting it upside down or just blocking out all the areas around what it causing difficulty. The point is to learn to paint what you see, and not what you "think you see". I think color can be like that too - that we get caught up in our love for particular colors that we fail to see/appreciate the colors we're using because they are someone else's favorites. If we can find ways to see those colors differently, to stop comparing them to the colors we naturally love, we can expand our ability to work with any color successfully. Glad your client was pleased with the pieces!! That's always rewarding!!