First game. Having clear face shot for at least half a minute on a "leetsofter", but he has minimalist goggles and I'm at a few meters distance, and shouting bang he would not know who it was and I'd get lit up by his mates. End up with him eventually spotting me and lit me up with a hot gun.... that sucked
If you can only hit the face, do it and don't apologise or feel bad*. It's an action sport and anyone who played more than one game have made a concious discussion not to protect their face.
*Unless their eyes are unprotected, then making sure they are not fired at and informing the player so it can be corrected is the highest. Even if you have to call a hit or pause the game. Even if you would shoot someone in the eye, don't feel bad about it - it is an action sport, accidents happens and it's not your fault unless you did it deliberately.