My mentor, Dori DeCamillis, taught me that when laying out your palette you should put out all, or almost all, your color whether you think you need them or not. The reason nothing is truly only the color you think you see. For example, what color are these apples?
Do you see it? There are so many other colors in there. Pinks in the skin, dark grayish blue in the shadows, white in the highlights. I even see a little light blue in the highlight on the top of the apple to the left. So don't be scared of wasting paint and go ahead and get it all out. You may surprise yourself. Oh, and my color tip for the day? Try a little caucasian flesh tone mixed with blue for that funny little color you see around the base of the stem.
Do any of you have any tips or favorite color combos you'd like to share? I'd love to learn from you.