If you’re looking to learn how to approach a girl right, then keep these things in mind:
1) Distance.
You're either approaching too close or too far away.
So, the optimal distance when a woman is moving toward you is about three meters.
If she's standing in front of you still, you want to be about arm's length away.
2)Vocal volume.
Project from down here in the diaphragm when you speak so that they can hear you talk.
3)Downward Vocal Tonality.
Using a downward tonality at the end of your sentences projects more authority. It shows more dominance, and more of that masculine strength she's looking for.
4)Keep and hold eye contact.
She can't feel that gut-level attraction if you're not connected with the eye contact.