Currently, cum_on_face aliases to facial_cumshot and facial is by itself. In my opinion, there's a difference between them all.
A facial is having someone cum on your face.
A facial cumshot is the actual act of cumming on someone's face.
You can get cum on your face but not have been given a facial (say, giving a blow job and it dribbling out... though there might be a cum_on_chin tag).
There are some implications that would come of this that, as far as I can tell, don't exist. A facial cumshot implies a facial and a facial implies cum on someone's face.
Any input? I'm not ready to go messing around with the aliases and implications pertaining to this without some other opinions.
Updated