Paint the details
The forehead and the chin should be colder than the cheek, so I add a little green or blue to these areas. I apply darker green and purple to the neck because it’s partially in the shadows. The chest area should be colder and lighter in value because it’s rarely exposed in the sun. Except for the cheeks, where I use a Soft Round brush to add the blush, I use a regular Hard Round brush. I set the Opacity at 30 per cent or lower, and paint on layers upon layers, so my brush strokes aren’t evident.