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.
Flower painting is the refinement of still life. You have the same control of combination, but you have not the same control of time. Flowers will change, and change more rapidly than any other models you can have; and at the same time they are so subtle that the most exquisite truth and justness are necessary to paint them well.
People seem to think that any one can paint flowers. On the contrary, almost no one can paint them well. There are not a dozen painters in the world who can really paint flowers as they ought to be painted. Why? Because while they are so exquisite in drawing and color, and so infinitely delicate in value, they are also even more infinitely subtle in substance and sentiment.
When you have got the drawing and the color and the value, you have not got the _quality_.
What is the petal of a flower? It is not paper, and it is not wax, neither is it flesh and blood, of the most exquisite kind. All these are gross as substance compared to the tender firmness of the flower petal; and the whole bunch of flowers is made up of petals.
Yet you cannot paint the _petals_ either, else you lose the _flower_. You must paint the _quality_ of the petal, and the _character_ of the flower.
All these things make the mere perception of facts most difficult, and it must be done with full knowledge that in an hour it will be something else, and you can never get it back to its original form again. Yet you cannot paint a bunch of flowers in an hour. What will you do?
=Mass and Value.=--There is something besides the flower and the petal; there is the _mass_. The mass is _one thing_, and it is surrounded with air, and air goes through the interstices of it. You must make this visible. The difference in value in flowers is something "infinitely little," as a great flower painter said to me once. Yet the difference is there. The bunch has its nearer and its farther sides, and the way the light falls on it is the most obvious expression of it.