Yes sure you are right and she doesn‘t have to smile if she is who she is and comfortable. I just got the feeling that she is making those facial expressions like looking way to serious for example for a winning pose on purpose on the pictures.
And sure she can be masculine which is not a problem but she catches your attention with that attitude which is not linked with a negative meaning.
Judging her as a spectator she looks like she may have serious problems with coaches in a few years when her confidence grows and realizes how important she is for the future of turkish volleyball. I am judging her with almost no knowledge about her as we couldn‘t watch her regularly but she reminds me as the female version of Ngapeth, as she could be difficult to work with, but as I mentioned before just first expressions nothing serious and it can turn out completely different.