Always commence the portrait by putting in the background. Among the four different methods which I have given, the student can make his own selection. For myself, I prefer the last two mentioned.

There can be no definite rule given for the lights and shadows in the backgrounds, as every portrait will need a characteristic background adapted to the subject. There should always be a nice disposition of light and shade, the light coming against the dark side of the face and the dark against the light side, and generally a cast shadow. What this is may be learned by setting a cast (or any other object) near the wall, letting the light strike it at an angle of 90 degrees, and noticing the size and position of the shadow thrown on the wall. The cast shadow in your background must not be too near the head, as simplicity should be one of the principles of the background, and this can only be attained by breadth of light and shade. The background is of secondary importance, and should not intrude itself on the portrait in its effect of lines or light and shade. Backgrounds for half or full length figures need especial study in their effect of lines, and one who intends to succeed in making them properly should study linear composition in Burnet's essay on Composition,[A] especially the following passages. "Composition is the art of arranging figures or objects so as to adapt them to any particular subject. In composition four requisites are necessary—that the story be well told, that it possess a good general form, that it be so arranged as to be capable of receiving a proper effect of light and shade, and that it be susceptible of an agreeable disposition of color. The form of a composition is best suggested by the subject or design, as the fitness of the adaptation ought to appear to emanate from the circumstances themselves; hence the variety of compositions.

"To secure a good general form in composition, it is necessary that it should be as simple as possible. Whether this is to be produced by a breadth of light and shade, which is often the case with Rembrandt, even on a most complicated outline, or by the simple arrangement of color, as we often find in Titian, or by the construction of the group, evident in many of Raphael's works, must depend upon the taste of the artist. It is sufficient to direct the younger students to this particular, their minds being generally carried away by notions of variety and contrasts.

"In giving a few examples of composition, I have confined myself to the four simple and principal forms, not only from their being most palpable, but also from their possessing a decided character, which is at all times desirable. To those who imagine that such rules tend to fetter genius, I shall merely quote Sir Joshua Reynolds, whose works, if properly understood, render all other writings on the subject of painting superfluous: 'It must of necessity be that even works of genius, like every other effect, as they must have their causes, must likewise have their rules. It cannot be by chance that excellencies are produced with any constancy or any certainty, for this is not the nature of chance; but the rules by which men of extraordinary points, and such as are called men of genius, work, are either such as they discover by their own peculiar observations, or are of such nice texture as not easily to admit being expressed in words; especially as artists are not very frequently skillful in that mode of communicating ideas. Unsubstantial, however, as these rules may seem, and difficult as it may be to convey them in writing, they are still seen and felt in the mind of the artist, and he works from them with as much certainty as if they were embodied, as I may say, upon paper. It is true these refined principles cannot be always palpable, like the more gross rules of art, yet it does not follow but that the mind may be put in such a train that it shall perceive, by a kind of scientific sense, that propriety which words, particularly words of unpractised writers such as we are, can but very feebly suggest.' (Sixth Discourse)."