Highlights - Titanium whiteNotice that the progression from highlight to shadow proceeds from opaque to transparent. Note also that this same progression alternates from cool to warm, cool to warm.
Lights - Titanium white, yellow ochre, and perhaps burnt sienna as well
Half Tones - Green earth and yellow ochre, and perhaps titanium white
Shadows - Burnt umber and yellow ochre
After reviewing my colors, I spent time reading the "Elementary Tone Exercises" in Harold Speed's "Oil Painting Techniques and Materials". My takeaway was that I might try to initially see the overall shapes and tonal values, rather than fuss with detail.
And today I came across the idea of blurring digital images to mask detail and better uncover masses of color and tone.
I think I am onto something here but the proof is in the doing. Unfortunately, surprise commitments pull me from my kitchen table. Sigh... Maybe later tonight I'll get my chance. If not, tomorrow evening for sure. I'll be trying to lay down the beginnings with sponges before moving on to brush.