While doing the portrait of Stella, I continue by adding warm tones to her face along with shadows in blues, gray, and brown around her eyes. A gray or black fur is best started with blue for me, then adding small amounts of purple or reds for different tones. I rarely ever use black pigment. My favorite combo for mixing good dark black colors is, strangely enough, a green and red mixture. These two colors combine to produce a much better black color.
In the background, I am trying out some brown tones on the branches but am getting an uneasy feeling about how distracting those tones are. They are taking away from the focus on her face.