I think there needs to be some obvious additions; better hairstyles- bc most are short, ugly cuts that look self done. Or, if they are long, they're incredibly lackluster & could use obvious improvements like "bangs"- not everything has to be about a giant forehead.
More long up-do's like Hilda & Lyse's ponytail. Better designed short hairstyles, not everything has to be an ugly spikey mess.

The textures to most of the races are really boring & often make them just like a blank mannequin- there's no natural flush, contour or blemishes that we can choose from. Elezen & Hyur could really use some love in that aspect.
I think Hyur's should be given half-elven options- like Hilda
Miqo'te should be able to choose between markings, rather than choosing a face because of markings
Au Ra should have interchanable horns, rather than choosing a face because of the horns. That way, there is more diversity
Viera should have more likeness to how they looked in FFXII- (Frans ponytail, Mjrns bob cut) better upright ears, spotting on their ears & they need more racial based shoes because Viera feet are meant to be abnormal & they walk on the tips of their feet.

Overall we should be given more make-up options (not just abunch of terrible face paint) & able to wear more than 1 make-up at a time
More make-up colouring that isn't so freaking saturated