contingent. 1  dependent for existence, occurrence, character, etc., on something not yet certain; conditional (often followed by on or upon): Our plans are contingent on the weather. 2  liable to happen or not; uncertain; possible: They had to plan for contingent expenses.
Get a brush. Face masks are best applied with a soft-bristle brush, such as a paintbrush (normally used for art making) or a tint brush (normally used to apply hair dye). Invest in a brush that you will use for this purpose, and be sure to clean it when you are done.
They're likely using a tinted powder for shading, and a contour brush to distribute the color without leaving a telltale stripe behind. Somewhat like a blusher, a contouring brush helps add definition to the face, but this is more about suggesting an underlying structure than adding a healthy glow.