>>4770131It’s just one aspect of composition, just as color is. If your image has more emphasis on showing form (dimension not shapes), it’s a good idea to lessen the contrast between the colors. True artistry comes when you learn how to control these elements, and show what to emphasize for your purposes. It depends on your taste, but traditionally, form is deemed more important, simply because it is a bit more technical (as technical as art can get), whereas in terms of color, I believe you either are a color person, or you aren’t.