Derain painted his buddy, Matisse in exaggerated colors, but a B/W of the portrait reveals how closely he held to the actual values.
This version of Mt. Hood is familiar and outrageous at the same time. The colors and the values are in the ballpark, which allows the brushstrokes to be more about form than content.
Play around with the images that follow. Value is the real heavy hitter. Try holding on to a reasonable interpretation of the relative darkness of the shapes in your first attempts.