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You sure have an eye for picking out and using colors that are very close to each other!
Something tells me that this wasn't all done by hand, or there was a mistake made somewhere. I had to highlight it and look at my monitor at an angle to see the dither-pattern in the 'pink' section of the skull.
Those light colors you used for AA'ing obviously, by any means, don't work either, because they're virtually indistinguishable from the colors around it. Makes me wonder.
Unless I'm color blind.