Sshodan wrote...
I'd go for lack of eyebrows, instead some skin marking on the forehead, completely white glowing eyes with no pupils or irises, very pale grayish skin (no sunshine for generations, any pigment it had should be extinct by now), differently shaped nose, maybe with 3 or 4 nostrils and mouth with no lips. I'd although give them non human teeth - either add some fang like teeth or a dinosaur style "chewing ridge".
The combo can still look aestetically pleasing, but woun't look like girl-next-door type in helmet.
And on a subject of hair - realistically there will be no much hair after generations of wearing helmets. Some fuzz ad best as a genetic remnant - hair is an environment protection mechanism, which is rendered useless by helmets.
I can be allright with most of what you said on here, especially the underlined part (just look at the pic I posted earlier in the thread for reference, forgot which page, though). My choice of reference depiction matches a lot of what you like, regardless of the eye-glow issue.
However, I disagree with your underlined part, though oddly enough the reason for that is based on one of the suggestions for mouth structure you gave. When I think of girl-next-door type, I usually think smaller lips, kinda-bubbly smile, depicting a sort of innocence, or even nerdiness. Bigger lips always mean "seductress" or "femme fatale" to me, even on female characters who aren't even supposed to have those qualities. Tali, to me, does not fit the "seductress" type, so she shouldn't have bigger lips, in my opinion.
Basically, I would like them as small as possible while still being kissable. Again, I say you should look at my reference pic, as I think it has near-perfect lip ratio.