Here you can find pics of Chibi-Usa as she *should* have been in the first place, right from the beginning: in her Teenage form. Of course this would have to go along with an appropiate change of her character since a change of her appearance only wouldn't be that much better if she's still the same annoying brat inside ^_^;;

original Teen Chibi-Usa pics
These are actual screenshots from the Teen Chibi-Usa episode in SuperS (#158).

Sailor Sun pics
These are the pics of above which I've retouched and where I've changed near anything so she looks like a completely new senshi ^_^