I start layering the main colours.
The first colour will be a grey blue of which I select a "shadow" tone and apply it to the tunic and trousers having care to leave a thin black line between the different elements like the tunic and the armour in the example below.
Then i over paint with the mid tone leaving the first layer where I want shadows to be.
The final stage is layering the light tone where they are most needed to show the shape of the elements, like the creases on the wool tunic.
Try to work from inside to outside and not to miss spots that are very important to show the depth, like the tunic under the magic pot in the example below.
I use to give the shadow layer two coats of paint to have a good solid base on which to layer the subsequent tones.
As you can see in the example below, after only one coat some black is still showing from under the grey blue.
This are the three tones used. I use to leave the dried paint on the palette for later reference if I need o to mix again the same tone.
The same technique is used to paint flesh
and raw wool clothes.
Here the whole clan with main colours completed.