Well to be honest, in her younger days she obviously didn't wear as much make up as she does now
She looked a lot more natural. As for her voice, in those older songs she sang pretty low (kinda like she's doing now), for her first album till like some songs in MY STORY (maybe even now if it's slipped my me xD) she sang in a higher pitch, but she had less control over her voice that way (thus why she didn't really get much vibrato in for a while). You know how Japan is, you just gotta be cute
