In the pic of the video, the one on the left used three or four colors of blue.
The one on the right used black.
The one on the left matches her face structure and her skin color and is the complementary color of the skin tone and lipstick.
The one of the right is none of those things.
Not every woman is good with color coordination. I guess that is what high-priced makeup counter are for. So, if you are not a natural, my suggestion is to find someone really good and set of colors for yourself.
On learning to apply, I suggest learning to sketch. Drawing with a basic pencil works those important hand-eye coordination skills. Especially the flick of the wrist moves.
Question if you had your boyfriend do your makeup before important events, how would you feel about that?
I'm kinda good at drawing but I feel like brushes are a lot worse when it comes to control. I can't paint tyo save my life. If my boyfriend where to do my makeup I would feel secure in the knowladge that he never would make me look bad (purposefully) but I might get hurt once or twice when it comes to eyeliner