As I said, I don't really have too muscle. I never had. My arms have always been slender. That's what I consider one of my "advantages". I have certainly lost muscle as well as power on the bike, although I can still ride long distances. For give an example, I can lift a 35 lb kettlebell above head (triceps workout) about 5 times (using both hands). My grip is still strong (hand grips at 60 kg setting - 30 reps). So I can usually open tight lids. I found that with estrogen it's extremely hard to gain muscle but at least I'm trying not to lose strength (at least not too much). My FTP is 207 W.
I just do simple exercises like overhead press, squats, deadlifts, bicep curls , planks....
Regarding breasts I have small but definite breast mass (not just fat). I don't wear bras though. They seem to serve no use, at least while mountain biking or running. Maybe later on when I start to present as a woman I will.
Oh forgot again, I have navel length straight (grey though but who cares) hair and my face is somewhat oblong. My mom and AI say that long straight hair doesn't go well with oblong faces but I personally love it. When a hairdresser did layers on it I hated it and it took a long time for it to grow again while cutting it so it's one length again. Also, one time I had my hair trimmed they cut way too much and it hurt me again. It took a long time for me to feel ok again. So now I trim it at home.
When I wear some tight fitting clothes (like a thermal shirt) and, let my hair untied and look at my reflection I think "damn girl you look good". It's a great feeling that boosts my self esteem, as stupid as it may sound.