Board Thread:Questions and Answers/@comment-43971605-20200129223825/@comment-36009152-20200421172931

68.217.194.33 wrote: Montell Riles(me): why is this discussion about my beloved Shinoa shisuta imouto-san/my waifu's hair?... Because I don't think just because Shikamadoji comes back, that doesn't mean her hair will change. The first post concerned Shinoa's hair color, and it raises some important points about the art style used in the series, to whether it is an in universe indication of the demonic warnings that may or may not be being shown. It's all guesswork with what we have now, mind.

It could be both or neither, but official or fan images it's certainly some lovely artwork, that's not in doubt!