After adding layers and shading to the eyes, I work with the under colors in the face.

I am trying to establish a warm and cool side. The colors are bright, but I am wanting the skin to really glow.

In building the layers, I like to scribble over the underpainting to soften.

I begin to subtly sculpt the contours with warm and cool colors.

More scribbling

The colors around the face will affect the colors in the face.

There is so much detail in the face, I want the background to be loose and rich.

I work from the upper left to the lower right so I can steady my right hand by leaning on the paper without creating smudges.

I am constantly thinking about edges and whether to make them soft, sharp, light, dark or warm or cool.

Completed!
I like to let it sit for a while, glance at it often and decide if there is anything I would change before signing and framing.