But for all that, painting does, and always must, deal with those obvious facts; and however much you may give your mind to the problems of composition and color, you must base it on a foundation of ability to represent what you see. Represent well the external objects, and you are in a position to interpret the spirit of them. For as nature only manifests her inner spirit through her outward forms and facts, you must be able to paint these well before you can do anything else.
The intellectual action which perceives and constructs is the art, the skill which represents and reproduces is the science, of painting.
Painting is the art of expression in color. The fact of color rather than form is the fundamental characteristic of it. The use of pigment rather than other materials is implied in its name. Therefore the science of painting deals with the materials with which to produce on canvas all manner of visible color combinations; and those processes of manipulation which make possible the representation of all the facts of color and light, of substance and texture, through which nature manifests herself.
It is not enough to have the pigment, nor even that it should get itself onto the canvas. Different characteristics call for different management of paint. Luminosity of light and sombreness of shadow will not be expressed by the same color, put on in the same way. Different forms and surfaces and objects demand different treatment. The science of painting must deal with all these.
It has been said that there are as many ways of painting as there are painters. Certainly there are as many ways as there are men of any originality. For however a painter has been trained, whatever the methods which he has been taught to use, he will always change them, more or less, in adapting them to his own purposes. And as the main intent of the art of an epoch or period differs from that of a previous one, so the manner of laying on paint will change to meet the needs of that difference. The manner of painting to-day is very different from that of other times. Some of the old processes are looked upon by the modern man as quite beneath his recognition. Yet these same methods are necessary to certain qualities, and if the modern man does not use or approve of those methods, it is because he is not especially interested in the qualities which they are necessary to.
There is probably no one statement which all fair-minded painters will more willingly acquiesce in, than one which affirms that the method by which the result is attained is unimportant, provided that the result is attained, and that it is one worth attaining. Every man will, whether it is right or not, use those methods which most surely and completely bring about the expression of the thing he wishes to express. In the face of this fact, and of the many acknowledged masterpieces, every one of which was painted in defiance of some rule some time or other alleged to be the only right one, it is not possible to prescribe or proscribe anything in the direction of the manipulation of colors. The result must be right, and if it is, it justifies the means. If it be not right, the thing is worthless, no matter how perfectly according to rule the process may be. As Hunt said, "What do I care about the grammar if you've got something to say?" The important thing is to say something, and if you do really say something, and do really completely and precisely express it, as far as a painter is concerned it will be grammatical. If not to-day, the grammar will come round to it to-morrow. Henry Ward Beecher is reported to have answered to a criticism on grammatical slips in the heat of eloquence, "Young man, if the English language gets in the way of the expression of my thought, so much the worse for the English language!" In painting, at any rate, the complete expression of thought is grammatical, and if not, so much the worse for the grammarians.
Try Everything.—Know, then, all you can about all the ways of manipulating paint that have ever been used. Use any or all of those ways as you find them needful or helpful. There is none which has not the authority of a master behind it, and though another master may decry it, it is because, being a master, he claims the very right he denies to you.
Experiment with all; but never use any method for the sake of the method, but only for what it is capable of doing for you in helping expression.
Safety.—The only real rule as to what to use and what not, applies to the effect on the permanence of your canvas. Never use pigments which will fade; nor in such a way that they will cause others to fade. Avoid all such using of materials as you know will make your picture crack, or in any other way bring about its deterioration.
Good Painting.—But for all I have just said, there is an acknowledged basis of what is good painting. If any man or school lays on paint in a frank, direct way, getting the effect by sheer force of putting on the right color in just the right place, with no tricks nor affectations, that is good painting; and the more simple, direct, and frank the manner of handling, the better the painting.