Dahunter, an associate of Mystery says: "Never open with a full-frontal opener." You should not have your full body language facing them. Talk to them side-on, as if you are in a line at the bar. After establishing rapport with the target, move away, even just a few steps, to create an intimate zone together.
Holding eye contact displays confidence and breeds charisma. On the other hand, it can escalate conflicts. To de-escalate conflicts, look down (although that will be perceived as a sign of weakness), or look to the side (stronger).