I'm six weeks into HRT, and interestingly, I'm starting to see some really subtle changes. I'm actually starting to pass consistently, but I do attribute that mostly to my voice.
Anyway, when I was showing a trans friend my pics, she said it seemed HRT was making my face slightly more angular. I'm small framed (5'4" and 105 lbs), so her thought was that I needed to put on weight. The problem is that I've been trying to put on weight like crazy over the last number of months, but to no avail.
Has HRT adversely affected your ability to pass, if you started off weighing not that much?
Here are some pics (I apologize if you've seen my posts elsewhere):
http://imgur.com/a/Wfawo