Most of us start this journey with a bit too high expectations on what HRT would do. And in some cases maybe all of those expectation might come true, after lets say 10 years of continuous hormone therapy. For some, well, maybe never.. maybe their expectations were just little too idealistic. Maybe their body just doesn't react to it in such drastic way that might for others. Those still early in the process will learn the truth sooner or later. It literally takes time before some real changes happen. Literally. I remember watching some of those silly update videos on youtube before I started with hormones. It usually goes by the same pattern. 2 month update: a LOT of changes, can't believe, amazing, skin, hair, boobs growing, face changing, everything... 3 month update: super amazing body fat transformation, ass is really getting enormous, hips too, and boobs are really really starting to hurt, I'll probably have C cups before summer, probably. 5 month update: still not quite A cups, but its still 3 months until summer, so C-cups on the way!!! 7 month update: still waiting ( improved face though, due to improved make-up skills and shaped eyebrows ). 9 month update: nothing really changed, getting slowly more and more depressed. Summer is here, boobs are nowhere, body really doesn't look that much different than before. Slowly starting to realize that make-up is essential for people not calling you sir, etc... 11 month update: still waiting for some real changes... 12 month update: isn't really an update, but 1 year transition collection of best angle photos... 14 month update: .... Well there isn't anymore updates as people by that time usually realize that it literally takes time, and start to spent their time with more important things (than waiting for changes and looking at their body), such as saving money for FFS or hairtransplant, or body fat transfer, or breast augmentation, etc, or they have simply accepted the fact that they got what was meant, and just go with it.
Chances that HRT drastically changes anyones face are none. Some softening and rounding makes some difference but doesn't exactly mean its a drastic change. Those who expect drastic improvement are in for the surprise. A dissapointing one. There is a thing for more drastic improvement. It's called facial feminization surgery.
Starting at age 11, or 12, before the start of any puberty related growth spurt means body will never make drastic transformation from masculine apperance to ideal feminine one that we get bombarded with from every possible advertisment oppurtunity or inadvertently. Self acceptance and realization of this is more essential than anything else, and much more healthier than severe body feminization with multiple never ending surgeries in search of perfection. But if some body fat transfer from belly to butt in a brazilian way, would make you feel better about yourself, definitely go for it.
More important than everything is understanding what you really want and need, for you, and only you to be happy and have positive self-image, so you can face the everyday life without worrying about anything trans, transition and everything that kind related.