There's no Zandalari though?
In all seriousness, they could just give them the corresponding options as the 'original' races. It looks like at least the face paint options for trolls fit on Zandalari. The tattoos are kind of iffy but with a few changes it could work. I tried it with my Zandalari character in Blender. I can post a picture here if anyone would like to see
(If you check Wow.Export for the new race options, the textures for them are there. If you put any of the tattoos options on the corresponding texture for an Allied race,
it'll sort of match up)