The most famous, most commonly-reproduced Kongzi portrait, or the
Kongzi yanju xiang (Ming dynasty), painted him with relatively dark skin. Compare the skin tone of Kongzi with the background color of the aged xuan paper.
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Below is another well-known portrait of Kongzi and a portrait of his favorite student, Yan Hui, done by the same artist. This set of half-length portraits was initially hung in the Imperial Palace during Qing times, so the portrayal here is very much an officially agreed version.
Note the very obvious, if not dramatic, difference in skin tone between Kongzi (right) and Yan Hui (left).
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I would say the FXS art team actually did a tremendously good job of faithfully modeling Kongzi based on the traditional art depictions. It is like Kongzi, who we only knew from the portraits before, now comes to life. His postures and movements are based on traditional salutes as well. (My only nickpick is that Kongzi should be taller, since he was a well-known tall and chunky person, almost like the Dwayne Johnson of his time.)