I say keep her masked. Because the image that people have in their head will be infinetly better than what Bioware could show. I agree with that one guy who said let us see some no name Quarians face and then we can build a general idea of that in our own heads.
It's like for anyone who has seen Sold Out: A Threevning with Kevin Smith. When he talks about how Harvey Wienstien wanted Kevin to actually show what Pillowpants looks like in Clerks 2.
Also, Who else is with me in the fact that I grew to like Tali, because of her personality (That and I needed someone with Decryption skill. So that's another reason for me) and how she and Shepard conversed in Mass Effect 1. Also because she was the one female on your ship that Shepard couldn't have as a Love Interest. I took her on every mission because I enjoyed her character. She was mysterious, and the Quarians have one of the best backgrounds BECAUSE they have to stay in the Enviro-suits.
I am just a little tired of people clamoring "People only chose Tali cause of 'DEM HIPS AND ASS' When that argument could be used for Miranda aswell. I mean come on, How many ass shots did they show of Miranda vs Tali. More Miranda I can tell you that.