I created a new layer for the shadows, at 50% opacity. I used a firm brush, with the opacity set to 35%, and painted in the needed areas: in the lower right area and on the mountains on the left, because the sunlight could not reach there. I then created adjustments layers with alpha masks; that is, Hue/Saturation and Brightness/Contrast, to achieve a single gamma. I painted onto the adjustment layers on the mask to create the different tones and contrast areas on various sections of the picture (Fig.09 - 18)