If there is much variety of color in the various objects of your composition, it is better to make your frottée suggest the different colors. Instead of making a monochrome frottée, rub in each object with a thin mixture, approximating the color and value, but not solid, nor as strong as it will become when painted, of course. Nevertheless, you can get in this first rubbing in, a strong effect, which at a distance has a very solid look, though the relations are not so carefully studied. When you come to put on solid color with this sort of an under-painting, it is easy to judge pretty closely of color as well as light-and-shade relations, and you can work more frankly into it.
Into this painting, when it is dry, you may begin to paint with body color, beginning with the true color and value of the lights, and working down through the half darks into the darks. Paint the background pretty carefully as to color and value, but loosely as to handling. Paint slowly, deliberately, and thoughtfully. There is no need to pile up masses of wrong color. You should try to be sure of the color before you lay it on. Study the color in the group, mix on the palette, and compare them. Think at least two minutes for every one minute of actually laying on paint. You save time in the end by being deliberate and by working thoughtfully. Put on color firmly and with a full brush, but there is no need to load color for the sake of the body of it.
Loaded Lights.—It was a principle with the older painters to paint the shadows thinly and with transparent color, and to load the lights. It gave a richness to the shadows and a solidity to the lights which was much valued. But don't think about this; don't let it influence the frankness of your painting. The theory is in itself largely obsolete now, and in fact has been disregarded by almost every able painter who ever lived, in practice, no matter what he said about it. I only speak of it because almost all books on painting have laid it down as a rule, and you had better know its true relation to painting. Like all other traditional methods of painting it has been used by the greatest of painters, and has also been disregarded by the greatest of painters; and as far as you are concerned, you may use it or not as suits your purpose. The main thing is to get the right color and value in the right place, in the most direct and natural, in the least affected, manner possible.
You may work into your frottée, then, more or less solidly as you feel will give you the best representation of the color you see.
Solid Painting.—Don't paint always in the same way. It is a mistake to get too accustomed to one manner of procedure. Different things require different handling. Let the thing suggest how you shall paint it. If you want to paint directly, paint solidly from first to last instead of rubbing in thinly first. But always have an accurate drawing underneath.
In working solidly without previous laying in, begin where each brush-stroke will have the greatest effect toward establishing the appearance of reality. If the canvas is light, begin by putting in the main darks, and if the canvas is dark, do the reverse. You get the most immediate effect of reality by the relief; the relief you get most directly by putting in first those values which contrast with what is already there. Establish your most telling values first, then work from them towards less immediately effective things.
Color and Values.—Study the color at the same time you do the value. Put on no touch of paint as a value or a color alone. If you do, you will have to paint that spot twice,—once for the value, and again for the color. You might as well paint for the two qualities in one stroke. It takes more thought, but it gives you more command of your work. It doesn't load your canvas with useless paint, and it saves time in the long run.
Relations and Directness.—Study to give the true relations of things. Try to get the just color quality. Give it at once. Don't get it half way and trust to luck and a subsequent painting to correct it. You will never learn to paint that way. Paint intensely while you paint. Use all the energy you have. Paint with your whole strength for a half or a whole hour, and then rest. You will accomplish more so than by painting all day in a languid, half-hearted way.
Directness.—Directness comes from making up your mind just what tint of color and value is needed, and just where it is to go, first, then putting it there with no coaxing. Get the right color on your brush and plenty of it; then put the brush deliberately and firmly down in the right place, and take it directly away, and look at the result without touching it again till you have made up your mind that it needs something else, and what it is that it needs. Then do that and stop.
Directness and justness of relation are the most important things in painting. They tell for most, result in most, both to the picture and to the student. Whatever you do, work for that. Try to have no vagueness in your mind as to what you will do or why you do it, and the effect of it will show on your canvas.