I just hope that my Shepard gets to come back to Tali, and live with her on Rannoch now that it's all over. Giving her a new face would be nice. But I'd just prefer a full modelling of the face instead. I mean I like a lot of the fan images, but the only one I really absolutely love is this one:
They could implement it by extending the scene on Rannoch where she's over looking the landscape after the mission. The camera could pull back to a somewhat obscure distance and show her face for a few seconds.