i think it would be nice if the aesthetician's services could be upgraded to include changing skin/eye color. for the sake of "lore" it could just be that the aesthetician can provide you with skin cream and colored contacts.

but first rather than just give you those options, involving crafters/gatherers would make it all the better. allowing gatherers to obtain materials for crafters to process into these items would be an interesting way to involve crafters/gatherers for player customization.

i just had this idea because compared to wow's barbershop (which allows for hair, hair color face, skin color, eye color, and even gender alongside race specific customizations for a token amount of gold). i'd say this is one of the few things, alongside the transmog collection, wow has over xiv when it comes to character customization.