"Color & Light" by James Gurney is an excellent resource for any artist. He explains many nuances on the topic of painting color and the interaction of light sources have on our perception of color. He quite easily simplifies a very complex topic that all artist encounter as some point in their studies."Color & Light" can be found on Amazon or on James Gurney's blog Gunreys Journey. This book is a great resource that you will come back to again and again..