Here is another example: The painting to the left has an entirely different color palette. The dominance is in the warm green area as illustrated on the color wheel below. Second to this is the cool green area in the forground- the painting reads as green dominant, warm-to-cool. There are small accents to this, cool reds and warm reds (oranges).
Try this - get out a color wheel, put it in a plastic sheet protector. Using a felt tip pen draw on top of the sheet protecter with the color wheel inside. Start analizing the color dominance in your paintings.