I'm on break, so I didn't get to read everything, but:
Short answer: it depends on how young you are.
If you managed to get on blockers for puberty, your facial appearance will be much more female. If you're getting on hormones post-puberty, your face will stay largely the same -- the exceptions being feminized and thinner skin, giving your face more of a glow and a lighter shade, and some fat rearranging, which typically influences the fullness of your cheeks (the degree of which varies from person to person). Depending on how well your body hair responds to hormones, you may see some eyebrow thinning or reshaping, but I think this is rare.
The skeletal structure of your face remains practically unchanged by hormones (if you've gone through puberty already). While it's true that your facial structure is dependent on your parents and your genetics, it wouldn't be any different from any other person who went through puberty on the respective (testosterone or estrogen) hormones. This applies to people who are mid-puberty as well: if you reached, say, age 15 while under testosterone, then introduced hormones, your structure would have progressed as a male until 15, then female from then on until growth stops altogether.
The reason some people think that HRT is a sort of panacea for facial improvements is largely because of what it does for your skin. Skin condition is a pretty strong marker for feminine/masculine, and if you add in hair styles that manage to mask your brow bone or make-up that helps contour your nose, augment your eyes or lips, etc. then it makes for a drastic change.
If any of your structure was already feminine (especially your nose, chin, jaw, or brow ridge), then this goes a long way as well with your newly found skin, and can help take away from masculine bone structure.
Other common transition changes that help: laser hair removal/electrolysis. You can lose density above your upper lip (the philtrum) in particular with hair removal -- depending on how thick your facial hair is/was -- which tends to be flatter and more pronounced in males; this is mostly noticeable from a profile view. It goes without saying that removing facial hair altogether and exposing the now-feminized skin underneath serves as another huge pro-female gender marker.
tl;dr Your bones don't really change on hormones unless you have either not undergone puberty or are still undergoing it. The feminized skin (and fuller cheeks) you gain from HRT is a very enabling effect, allowing feminine hairstyles and the removal of facial hair to really take off for you. I hope this helped!