Step 4: Verdaccio
So this is way out of my league, but worth a try. The Verdaccio technique is underpainting in green. While Ivory Black and yellow is an option (along with many other combinations) I went with Chrome Oxide Green, mixed with Ivory and Lead White. Lead White seems to dry faster than my usual Titanium. Below shows two verdaccio glazes and a first layer background in Burnt Umber.