So, I thought it would be fun to run my pictures from the other thread that I just started today about my 3.5-month HRT progress through this machine... and, well, here is how each of these natural-faced pictures rated:
-Picture from 5 years prior to transition. Actual Age: 22.
Masculine: 92%, Feminine: 8%, Age: 44 (GASP!!!

)
-Picture from 2.5 years before transition. Actual Age: 25.
Masculine: 95%, Feminine: 5%, Age: 24 (there we go... that's better.

)
-Picture from very first day of HRT. Actual Age: 27.
Masculine: 93%, Feminine: 7%, Age: 30
-Week 2 of HRT.
Masculine: 92%, Feminine: 8%, Age: 20
-Week 4 of HRT.
Masculine: 45%, Feminine: 55%, Age: 24
-Week 6 of HRT.
Masculine: 47%, Feminine: 53%, Age: 24
-Week 9 of HRT.
Masculine: 19%, Feminine: 81%, Age: 24
-Week 12 of HRT.
Masculine: 49%, Feminine: 51%, Age: 24
-Week 15 of HRT.
Masculine: 41%, Feminine: 59%, Age: 24
-Current picture.
Masculine: 23%, Feminine: 77%, Age: 24
And in this most recent picture, the celebrities that it said I looked the most like were Lakshmi Rai and Kaveri Jha. Um... whatever. I guess I kind of have a similar nose and chin to Kaveri, but that seems a bit odd that it's saying I look like Indian models...
So as a whole, this thing seemed to be relatively accurate. Because before the girly pills did their magic, my face rated as WAY more masculine completely consistently, then started rating at about 50/50 during the early stages of HRT, and now has switched to rating as more feminine. And the age guess pretty much stayed the same the whole way through. There were, however, some very weird outliers, which is why I skipped a couple of the pictures, where that one certain picture from a certain angle produced results that were completely out of left field. So if you really want to get a good general idea, play around with it a bit. Have it take a look at multiple pictures, and see where the majority of the data falls.