As I say in the SBS ,I will do a first sitting which is wet on wet ,in other words I just apply the colours one after the other and blend them while still wet ,this will be putting in the shadows ,midtones ,and some highlighting . Then Stop ,let the face dry completely before the next stage ,if you try to rush it you will end up with a muddy mess ,so just leave it for a few days in a warm place were the dust cannot fall on it . The second sitting will be adding more highlights ,stubble ,details etc ,if needed you can do a third sitting for the detail painting .

Chris.