I was going to respond by linking yakumo_ran -tail with some witty comment about artist preference, but I've come across a much larger crime than in this image.
NeoDarkKnight said: Would that warrant an error tag?
I suppose so - but then again; at least in the traditional folklore variety, kitsune are shapeshifters, so I guess it technically would be possible for Ran to assume a human form without any fox tails.