Ground zero has always been the girls center of her forehead.  This allows it to drip down her face and give it the longest "hang time".  Cum eating and cum drinking is always popular in these movies.

In the late 1970s, many Japanese adult film studios were looking for ways to "push the envelope" for their Japanese customers. The first films usually featured a schoolgirl or secretary who willingly submits to one man after another. They come from everywhere off camera to shower her with ejaculate at just the right moment. As each man finishes, he silently leaves and another quickly takes his place. In some cases, the girl has sex with each man before he ejaculates on her face.

An excellent technique that will also help you aim your oral bukake bukaki ejaculate and drinking properly is to paint the eyebrows. You'll need to control your orgasm a bit to get at least two throbbing spurts. If you can get more, all the better. With the first shot, start at the outer edge of one eyebrow and work your way towards the other end. When you get to the bridge of the nose, take quick action and flip to the other eyebrow. With the second shot, competely paint this eyebrow. You should finish at the outer edge of the second eyebrow.