Can I see Tali's face?
When I finished the mission on Rannoch, Tali took off her mask, but I didn't get to see. Is there any way I can see her face?
Solution 1:
Yes there is. If you speak to her on the Normandy after that mission, she will tell you that she left something for you in your cabin.
If you then go to your cabin, you will find a picture of her without her mask next to your bed.
This only occurs if you've romanced her though.
Solution 2:
If you romance Tali, she will send you a photograph of herself without her mask on to your cabin. See the wiki for more.