I know that my suggestion will be unpopular, but i’d like to remove/replace things for the human form:
Removing black color skin as an option - it’s not by racism but to reflect the fact that Gilneas was really isolationnist at this time unlike Kul’Tiras which was founded by Gilnean settlers but didn’t close their harbors and borders.
It’s hard to imagine Gilneas welcoming people from the south knowing this.
It will also reflect the fact that Stormwind is more cosmopolitan and give some uniqueness to the classic human race.
Same idea with the Asian type (if the devs will release it), it should be an exclusivity for Stormwind humans.
Replace some hairstyles with Victorian and Edwardian ones as suggested by Azshulia, again to set the Gilnean humans apart from the Stormwind humans.
Replace Storwind jewelries by Victorian ones.
I know that the more the better but the idea behind is to avoid the Blood elves / Void elves situation where the Blood elves are basically giving nearly all their customizations options to the Void elves while not receiving something from the Void elves.