1) Are women are allowed to post photos on social media if they are wearing proper hijab?

2) If they are influencers and do various videos on headcovering and hijab styling, so is it permissible?

1) It is permissible if:
A- They are fully wearing the Hijab (neck covered up to the chin)
B- No make up at all
C- The image is professional and not suggestive in a any way.

2) As for influencers who show different types of fashion and styles, it’s not permissible because the Qur’an prohibits women from showing their Zeena (adornments) to non-Mahram men