I'm sort of inclined to think the Hello/How are you images shouldn't have the Miku tag. I mean, yeah, she's the one who sings it, but there's nothing that suggests that's supposed to be Miku. Anyway, it's not entirely unusual for PVs to feature characters who aren't vocaloids.
I won't argue it and I can see why you might tag it as such, but I'm just sayin'.