I love Elaine's/Julia's wall-of-hair look, with the long curls in back, that she'd perfected sometime in Season 2 and kept at least through Season 5 and maybe Season 6.
I think the jarring, unattractive, pulled-straight-back hair Julia now has is an effort to look like anybody-but-Elaine. Too bad. Remember when Elaine dolled-up her hair for John-John, hoping to run into him again at the gym? That classic Elaine/Julia look was hot.