Preliminary drawings or sketches in oil or pastel often have an immediacy and emotional appeal far greater than the final canvas.
I did some pastels and I did other pieces in which there was just basically one color per square, and then they would get bigger and I could get 2 or 3 colors into the square, and ultimately I just started making oil paintings.
Oil is like a wild animal. Whoever captures it has it.
J. Paul Getty