I still haven't got a good image of Choudhury in my head. (And I don't recall, is that pronounced like "shoe tree"?) Janina Gavankar, Rekha Sharma ... they both seem too young and pretty. Too much like Ezri and not enough like Jadzia, if you catch my drift, or maybe the pictures are all too sultry where I can't see someone who meditates that much being much caught up in all that desire
Here's Indira Varma, who was on Torchwood. She's the second from the left, with the oval face. Although she's only 37, the camera might put on a few more years.