A face lick means that the dog recognizes you as the “alpha”, the leader of the pack. That’s a good thing.
Olga does that and then immediately forgets I’m the leader when I try to get her to stop doing something.
When a female wolf or wild dog’s pups have their teeth come in mom stops breast feeding them and feeds them by regurgitation. To stimulate that response the pups lick her face and snout. This is what a dog is doing when they lick your face. They’re just trying to see if you’ve got anything good to eat.