First and foremost I have to point out that you actually look
REALLY GOOD in a purely aesthetic sense. You have this
modelesque look that some ciswomen have and many many ciswomen would kill for (and trust me, I'm not humoring you).
Second, your makeup skills look pretty nice and seems like you have quite a sense of fashion; so definitely you're doing right in these departments.
But if you ask me, with respect to passing, I would say that you're almost there, really close. I have to note that
3 months HRT is way too little time to see significant changes. I think that (and I'm being quite realistic) after 1 year (maybe more, maybe less) you wouldn't have much problem passing (appearance wise).
What I think that may give you away? Not that much your brow ridge (forehead) but a slight lack of softness in your face features overall (and this may be fixed giving more time to HRT to work). Your forehead height (overall size) looks fine, your nose looks fine, your jaw looks fine (maybe on the wide side, but still balanced).
Tips? Maybe your cheeks look a little hollow/flat. You could benefit from added fullness (hialuronic acid injections, cheek implants and more time on hormones): this would give wideness to your middle face, roundness overall, and help balance. Also dermal fillers in other face areas may give softeness.
Keep in mind you're really thin, so you should expect to be on the more chiseled side of beauty/style. I'm not advicing you to gain weight, though a few lbs may help too (or may not). Also having a nice voice may be a deal closer in your case.
In conclusion, be patient. You're just starting HRT, so it's so soon to make proper judgements

If you want to go full-time I think it wouldn't a crazy idea, you look rather fine and you always can wear androgynous-style outfits.