Wrong place.
You can use any gravity.
Create your own move.
If you're not complete shit (which you can't be if you want to do a successful, good-looking headpass), than you've gotta be smart enough to come up with your own moves.
Default gravity is (0.00 0.00) -9.28, semi-realistic gravity is (0.00 0.00) -30.00. A more realistic rendition would be about (0.00 0.00) -45.00.