Capturing Radiant Light & Color in Oils and Soft Pastel
by Susan Sarback. Here's an Amazon link.
I bought this book in 2009 or late 2008 while I was taking "Still Life the Colourful Way" by Colorix, here
in Soft Pastel Learning Center. I would recommend both the Sarback book and reading the old class thread from the beginning, including doing the exercises. Some new students have started a thread working through the class and I'm going to be participating doing an assignment I didn't get to during it. I missed the last couple of them due to weather and life concerns and the thread got archived before I did my projects, so now I might go back and do them since some folks are reviving it.
That completely changed how I look at color and painting. I got more in color theory from it than any other source, and I have many books and so on involving color.
Another really good book that I have here is Color and Light, A Guide for the Realist Painter
by James Gurney. Here's the Amazon link.
I bought his Imaginative Realism
some years ago before I moved and didn't bring it with me, his section on color was very useful and helped me a lot along with Charlie's class materials and the Sarback book. This volume focuses much more on color specifically and in relation to other elements of painting like value and composition. I think of both of these as really important books that I go back to often. Gurney's an illustrator and as an author is very good at breaking down color theory into understandable elements. I love his work, since I'm also very fond of dinosaurs and he's the artist-author of the Dinotopia series. He does use imaginative and fantasy subjects for some of his demonstrations but many are landscapes with old gas stations or diners, or wildlife and foliage. All his imaginative work is based in nature so he's really good for rendering anything natural, artificial or imagined.
Hope these help! The class thread is free and right here, so jump right in and try the exercises. It's a strange method of painting but it helps so much in unifying color and expanding color awareness. Also Charlie did go into composition more than once during it, especially in the sequences where we set up our own still lifes. Although Charlie's method starts with pure spectrum colors and I love the intense palette she uses, I sometimes get in a mood for more muted colors and have used the same method with muted browns and grays sorted into the spectrum color they most resemble. It works the same, just has a subtler color harmony. Also it's possible to build up to those muted browns and greys layering brights, so that shortened the number of pastels I need to have with me if I'm painting away from my house.
BTW "Your Artist's Brain" is fantastic for composition. I got that when I took Johannes Vloothuis classes online at his recommendation and it made things understandable that a dozen other books had left me floundering with. The examples are excellent.