it's especially frustrating when they're actually a good artist and yet somehow can't fathom that you can stretch the cat ears to connect closer to where the human ears would be for short hair to look less 'weird' on them without losing all physiological sense.
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And there's a LOT more where this came from.
I'd presume my own pet peeve would be when a story is so poor it can be easily replaced by "humans with magic" without any lore conflict