Hi Ms Camille

May I ask whether there is a limit to the addition of notes to my vocal range? If I train up my falsettoes enough, will that eventually become head voice one day? Sure, I can now hit F4 with head voice since I trained my falsetto, but will that apply to the extremely high notes? (e.g F5) 

Good question! I can't give you a specific pitch or range in which your falsetto sound will strengthen. As a generalization, most male singers can strengthen their falsetto into head voice (or a head-dominant mix) up to A4 (lower voices) or C5 (higher voices). Few male singers (though of course, some can) will extend past C5 with a lot of strength/weight to their sound. 

I see, so I guess there's going to be a limit / law of diminishing returns once I hit A4/C5.

Thank you! 

Happy to help, Kang!