“Orange” was done in the flavor of David Leffel. In his video, “Creating Form with Paint” he talks about dealing with the two edges, the inner edge between the light and shadow pattern and the outer edge which is the edge of the orange and the background.
The inner edge is dealt with simply by dragging the brush between the light and shadow to soften. The background color can be used to soften the edge.
But the way Leffel dealt with the outer edge was a great technique that I learned. The tendency is to slightly darkened the outer edge and lighten to wards the highlight. But the illumination is lost. Leffel shared that simply lightening the background next to the edge will maintained the illumination. Just a thin slight lighter strip of the background.
It’s a brilliant technique and I just love the effect.