It depends on the distance away I was when she first crosses my vision.
Legs are always a sure-fire eye grabber for me, which is what first caught my eye when I saw my wife.
Up close I tend to look for a returned smile. My wife and I will be walking down a street or in a mall, someplace anyway, talking along about this-n-that, and I'll smile at a lady or two as they pass if they are looking at us. The nice ladies smile back. But the grumps give us something to talk about for 10 minutes. They must really have a peg up their butts, etc.
Soooo, distance is legs, close is a nice smile.

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