And this post is how the artist learned they're colorblind:

Well, nothing some learning can't fix.
Otherwise, they probably can do well drawing goblin girls.

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CrystalLeaf said:

Don't they make special glasses for color-blind people?

If you’re referring to enchroma glasses, those were exposed as a scam. https://youtu.be/Ppobi8VhWwo.

commentary

@3kan_Noka they seem to have Deuteranopia Green blind colour blindness