Amala
Amala Focus on eyes and forehead - these are two major masculine markers -
I've noticed this too. The way the hairline hugs the forehead can very determinantly shift whether overall looks masc or fem. An inverted tapered V/ inverted U works best in my experience.
Would love to hear more about the rest.
Facial hair can be a giveaway, even when it's just a shadow. Concealer/color-correctors help with that. Am yet to master the art.
Having a cute face mask let's you mask these features and bring attention up and away towards your eyes and forehead again, which you can try to work on strongly.
This can be great in a pinch but not so convenient every time though. Like when going out eating etc.
Oh! And sleep well. Intense Dark circles can make anyone look like a zombie, be you masc or fem.. I've had some days where it was quite a big deal 😅, overpowering all else. Sound full sleep regularly helps cure it.