Here is Nancy's start (about 50 minutes in I think). You can see my start over there on the left.
Here is Richard's painting at about the third sitting. I love looking at his paintings close-up . . . he has an amazing economy of brushstrokes and his colors are always so pure and vibrant which breath life into his paintings.
You need to make sure that you apply them in a way that leaves some of the canvas showing through. It creates a luminosity that works to your advantage, letting the semi-transparent darks sit into the background and the opaque and thicker paint jump to the front. This illusion is something that I haven't been keeping consistent (having both transparent and opaque darks) which hurts the illusion. To create these transparent strokes, you can use either a dry-brush approach or use thinned paint -- the trick is to use a bristle brush and use a lot of pressure when you make the stroke.
Here is my painting at the end of the day.