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Attempted the rainbow snake, and focused on making it a rain deity.
The cloud is supposed to mimic a rain cloud and the body is the rain being poured.
I also think we should keep the head-feather things, seeing as if you google images of the rainbow serpent, a bunch of them have them, and in this they're supposed to be like raindrops.
The golden tipped tail also alludes to the gold at the end of a rainbow