I'm playing around with dune shapes, both to be eventually used and made available for others as map brushes and as fitting shapes for illustrations.

No. I was the first somewhat succesful shape I managed. II and III are more elaborate, though I'm undecided in what shape they'll work better (haven't tried the red labelled approach yet). I'm not sure if I'm taking the right approach to color them in example IV.

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Hints, ideas, opinions?