Nightmare moon sketch coloured

my sketch of nightmare moon coloured as a request from Nemet-HUN

i coloured this pic the same way as what my idea of nyx in past sins was, when she changed into NMM
the same as nightmare moon, but with a more purplish colour
i know tht nightmare moon is a canon character at her core, but i cant seem to be able to draw her without thinking of "Past Sins"