I personally like to grab a handful of hair at the back of the girl's head to hold her face tilted up. Then aim the head of my cock right at the bridge of her nose. If the girl's eyes are closed this will startle the hell out of her. So if she gasps, the next shot is going in her open mouth.

I like to pool the rest of the load on her forhead so that when I let go of her hair it runs down her face giving maximum coverage.