This photo was taken on a recent trip to Death Valley National Park. About 15 minutes after sunset, the dunes were cast in a beautiful blue shadow glow. I kept the contrast low to accentuate the subtle, milky lines of the dunes in the extremely soft twilight. I cropped to a 4x5 aspect ratio.
Canon 5D MkII
70-200mm f/4L
ISO 200
13 sec @ f/16