Here are some notes on my approach to the pallet.
"What I have done here is mix up five values of each primary (red, yellow, blue) flesh tone and grey. For yellow I started with pure cadmium yellow in the second square and added titanium white to lighten and burnt umber to darken. For red I started with Scarlet Vermillion(or Cad Red Light) in the third square and added white to lighten and Alizarin Crimson and Ivory Black to darken. For grey I used just Titanium White and Ivory Black (in the absence of blue this functions in its place). For blue I start with French Ultramarine in the fourth spot and add white to lighten and black to darken. For the flesh tone I start with a base of Burnt Umber and add white to lighten it. This will tend to look ashen so I add red and yellow from the corresponding values to warm it up, tending more towards the yellows in the light values and reds in the dark values"
There is also a book on Reilly's painting method "The Student Guide To Painting" by Jack Faragasso
Here is a link to more info on Frank Reilly