This portrait of Justine Gardner is another example of the strong impact that a limited palette of primary colors can achieve.

Justine Gardner playing bass at the Blues Jam

The key is using pure color and taking advantage of the inherent value of the local color.  Yellow will never be a dark value.  Reds and blues, used as pure undiluted pigments will never be as light a value as yellows and can be stretched from dark to mid-range with a bit of dilution.

Portrait of Justine drawn first with a black ink using a dip pen, followed by strokes of pure color allowed to mix wet-in-wet on the paper.