Explain the relationship of the various parts of the head & face to each other.
in terms of basic art; a three quarter view portrait.

Well its a given that 6 heads makes up a bodys lenght when drawing. yyou can draw the cross guidlines to form a face, drawing the eyes should be divded in the middle of the first horiznla line and there should be enough room to fit another eye bewteen them, the nose is placed the the cdenter of the cross and the mouth should be a twice as far down depedning on what scales the face is being drawn

Opposition of two melodic ideas is the  right answer