The shape, width and quality of the brush are to a great extent qualifying the effect you can achieve with it. You draw straight lines preferably with a flat brush, keeping the handle of the brush pointed in the direction of the line. To draw a thin line, you do not necessarily need to use a narrow brush. You can also use the edge of a flat brush for that. This brush is also very convenient for making a thick line merge into a thin one, turning the brush on its side in one fluid action as you go automatically changes the line from thick to thinner. When you come to the end of a line, lift the brush from the skin in a single smooth movement.
Hint: to make beautiful, thin lines, you mix the Water Make-up with Cleansing Lotion instead of water.
SHADOWING

Depending on the desired effect and the situation (nearby, far off), you can apply stronger or less strong lines. The naso-labial fold is easier to locate if one grimaces.

On an older person the skin, where there is little or no bone, is sunken. On a younger person these parts are darkened (shadowed), the skin will appear to be really sunken at that spot.