Best way to deliver and opener is over the shoulder. you are not quite in the conversation, you are heading away from the girls, thus they have to pull you back in to talk to you. With practice you'll get it right.
About your voice- this means you got tonality right. Congrats! When I was working on my body language there was a time when people started asking me if I dance (which I didn't at the time) but it meant I had reached a healthy, though not perfect, stance. Good voice and body language looks healthy and good, people WILL notice and WILL complement.
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http://www.solomonseagal.com
Anyone can walk into a bar and pick up a random girl.
The trick is to make the experience unforgettable to her.
A real PUA will make every women he encounters feel like she experience something once in a lifetime.