When drawing the head it is necessary to make sure that the proportions, i.e. the relative dimensions between its various constituent elements (eyes, ears, nose, mouth - which we will examine one by one later on) are indicated correctly and precisely. Of course, heads vary greatly in size and in the combination of characteristics, but they can all be reduced to a proportional diagram which helps to simplify the shapes, to recognise their peculiar three-dimensional aspect, and also to position details correctly in relation to one another. When drawing a portrait pay close attention to the overall structure of the head and evaluate its main characteristics as it is mainly from these that a good likeness depends. Details alone, even if minutely reproduced, almost invariably result in a vague and unsatisfactory portrait, when placed in a general context which lacks accuracy.
The diagrams shown here, if studied carefully, will provide you with the simple and essential elements of reference and proportion of a 'typical' head seen in frontal and lateral projections. Compare them with those of your model and assess whether they correspond or differ. The height of the face can be divided into three portions of equal size, which correspond to the height of the forehead (up to the hairline), that of the nose, and that of the lower part of the face.
In addition, note that if you join the three points located above the bridge of the nose, on the chin and at the corner of the jaw (near the earlobe), you have an equilateral triangle. The same figure is obtained if you join together the outer corners of the eyes and the base of the-lower lip. The width of the eye viewed from the front is a useful reference for measuring the distance between the eyes (according to an old academic maxim 'between eye and eye there is an eye') and the width of the base of the nose level with the nostrils. Notice how, viewed from the top, the head's shape is an oval, broader at the back.
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