Well, I made a thread with customization hopes, based on one that I made in the beta forum (and some of the hopes posted there ended up happening, like DK hair colors available for all, and human/dwarf facial hair being split into mustache/beard)
Go there, support suggestions you like and post yours!
Edit: Forgot to link:
https://us.forums.blizzard.com/en/wow/t/customization-hopes/690185?u=alamara-goldrinn