The eyes are incredibly powerful. I use them as an opener in and of themselves. If you can catch her eye across the room that is an incredibly powerful opener.
On eye contact in general, you should also pace the woman, notice if she's shifting away from you. Some women do not feel comfortable under a strong amount of eye contact, and you want to build comfort, of course, some women really feel intrigued by strong eye contact, and in that case, you want to up to make sure that you continue to look at her.
I wrote a post in the NLP board on Hypnotic gaze. A powerful ability to really allow a woman to feel both comfortable and open to you.
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