I block in very roughly on most paintings. Usually I go dull, then brighten up. Sometimes though I put in colors that are brighter than the local color of a subject. Case in point is this little portrait of a desert flower from Bryce Canyon. The rocks there are amazing and this painting is about the ledge and the flower. In the foreground, I put the pinks a little brighter and deeper than they read to me. Then when I completed the painting, some of that brightness comes through. Just enough to bring out the wonderful shades in the formations.
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