Practice looking at yourself in the mirror. Blind your calm face, then in a smile, aggressive, sad, etc. This way you can better understand which muscles change the grimace and the general structure of the face. Talking to family, friends, without attracting attention, try to consider Features of the structure of the face, its eyes, nose, mouth, the general shape of the head. The face in relief is a significant stepping stone to the complex genre of sculpture. Try carve a mask first, imagining, and then proceed to create a relief with portrait likeness. It is better to do it from life. But before that, do some drawing and modeling.