The basic colors are blue, yellow and green. Plus the white background creates a lot of contrast. While the yellow probably covers less space than the darker blue-green, the intensity of the yellow makes it the more dominant color.
Here the colors are also blue, yellow and green. But the dominance is heavily toward the blue spectrum.
In this painting the colors are stretched to include some that are outside the close relationship of blue-violet - enhancing the effect of disharmony.