Looks like NightMare Moon is more heavily armoured than in her televised appearance(s). The blood-red colour (from the whole "Blood Moon" thing) looks really nice; red is not a colour usually applied to or associated with NightMare Moon...!
Strange...she seems to look majestic and ave inspiring here, but not evil. By looking at this pic i'm starting to think that her real place in the world is to keep the evil creatures of darkness at bay,bringing fear to them by her immense power in order to protect the civilians that don't even know such evil exists.(somewhat like Aragorn said to Narkiss in LotR) The best way to describe her here is like "Dark Queen.Stern and very powerful,but very loving to her subjects."