One of the main aspects of art especially art involves drawing and painting is learning how to reproduce the face well. You may think, what is there to a face? It is after composed of the shape of the head and face and the various features. Sure, the lines of the face are a bit complex and need some study and practice to get right, but it is hardly something that should bother an artist who is serious about his or her art.
However, you are forgetting that cheekbones, jawline, forehead, nose, lips, eyes, ears and the various lines on the face are not the only things you have to master. In fact, if you rewind what we have said a bit earlier, you will realize that the eye alone poses a challenge. You will have to learn how to draw an eye and that too step by step. But that is not we are talking about here but about learning how to draw the eyebrows and that too draw them well.