Watercolor Sketching

I believe the negative space should be equally as interesting as the positive space (the subject).

Color terms may be helpful when talking about color. The first is local color. This is the basic color of a subject – we might say a banana’s local color is yellow. A second type of color is optical color. This type of color refers to when the artist tries to capture the true complexity of the light reflecting off the surface of an object. The banana may be yellow but on close observation we may see areas that are still green and yellow green. Closer inspection will show there are brown and black markings and some of the yellow seems to have bit more orange in it, and there are shadows on the surface caused by the light source. The color of the surface the banana is sitting on is being reflected on the surface of the fruit creating more color variation. This is the optical color of the subject.

You need to ask yourself, “Are those negative spaces interesting?”