There comes a point in Mass Effect 3 where, your actions permitting, you get to see what Tali looks like under her mask. To say it's a crushing disappointment is to take the piss.
Rather than stew in her own rage and/or send hostile emails to BioWare employees, Finnish artist K4ll0 decided to set things right and do the job properly. "How she looks here is based on my views of Quarian biology, geography of Rannoch, codex/dialogue, and earlier Quarian concepts", she writes, which basically means "her face looks like everything else Quarian in the game looks".
I like it!
Tali'Zorah [DeviantArt]