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I did this ink drawing while sitting on a dune in the Outer Banks of North Carolina. Before beginning the drawing, I tried to note the darkest areas. I also decided to use a "writing" style to define the dunes. This can particularly be seen in the close-up crop to the right. Note the writing "scribbles" defining the base of the dunes.

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I used multiple repetitions of connected lines to reinforce the darkest areas which was most of the bases of the dunes, as seen below.
