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I won't make it any lighter – it would look too unnatural. I don't see the point in reducing the saturation or brightening it. I'm thinking about renaming the green dragon to "Forest" or "Woodland" dragon. The screenshot was somewhere above (a page or two back), and it's not entirely green there. Besides, if you think about mythology, green (which is also gold or yellow) clearly surpasses azure. (Gold is imperial, while azure is just one of the guardians – the guardian of the east).