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Most shadows are not merely black but contain lots of colours, from crimsons, reds, greens to purples. Careful observation and accurate colour mixing is the key to capturing convincing shadow. Find and paint a colourful shadow. You can use this photo of a tree shadow or one of your own. Remember to squint.
Please be sure to follow the spirit and the letter of the challenge.
For example, each submission must be painted after the challenge is posted.