the whole gyaru subculture which still exists carried a lot of Ayu influence back in the day, and still does. Ayu is the role model in the hearts or many gyaru models. Tsubasa Masuwaka (Umeda) anyone? the face of Popteen and best Popteen model up-to-date, even though she graduated long time ago.
plus ageha fashions and make-up are hugely Ayu influenced
the blond hair trend supposedly did grew bigger among Japanese women at the time, but idk.
in 2000 she also trigerred the nail trend which is still super strong, do remember.
in 2000 - leopard, big puffy hime hair with big rose at the side (during SEASONS era), in 2001 the foxtail & war print. the glasses too.
in 2001-2002 the sports casual style and also jeans Ayu wore were much paid attention to. also, her tan and hair change during 2002 (rapid). I guess the accessories too, were a great part of her image.
gotta add that despite everything and how much time has passed, hamasaki ayumi in the eyes or Japanese is 2001 A BEST Ayu, that's the first image that comes to them
that what means propoganda, LOL, & 40+ magazine covers at a time
here's a couple of images of Ayu's influential looks, don't forget MTЯLG, was popular till 2005