Currently on vacation to visit family in AZ. Here's an early New years post.
(1-3) I can't read korean, but for contouring, the ideal shape that makeup artists tries to achieve is an oval face. Therefore, you want to brush darker contouring powder around the edges of your face and forehead.
- (4) For your cheekbones, you want them to stand you, so you would apply a highlighter there
The same with the bridge of your nose, you want them to be high and thin; thus you apply a highlighter on the top ridge of your nose, and darker powder on the sides to make them appear thinner.