Hi Norm. I don't really use dip, sometimes use an ink wash to touch up faces or hair where I have made a minor error or in particular to bring out cow hide knapsack like on the Swedish foot that Warfare and Foundry produce.
More the most part this is all shading. Dark base coat, sometimes leaving a black outline, lighter shading and usually a third even light highlight. Bit like the foundry paint system but using Colour Party paints for the most part.