Ujm, there is a heter for photographers, that when one is “tarud bemelacha” busy with work, they are not meharher – “the velt” says this, and i can look into it if there are teshuvos (im sure there are in general, but not sure if this heter is mentioned).
Re YouTube – i agree that YouTube isn’t a place for any ehrlich person, besides kiruv and the like. Whether it’s technically lifnei eiver or not, i don’t know. It’s also not tznius for a jewish woman to have her face all over the world.