>>38279179I'd tell you that isn't reference art, but you wouldn't understand.
So I'll show you. These are the official reference sheets for stage 1. We simply don't have the reference art for stages 2 and 3. But artists NEED that stuff in order to work. What you're looking at is print templates used in magazines like Corocoro and such.
That being said, those other images floating around are fake. And a back image would be even more important in a game that's fully 3D. Even if we were to find one with a back pose I'd still be skeptical. The artist could have just taken our criticism and added them later.
If you don't take this evidence as fact then you're up their in flat-earther tier denial anon.