I had no clue as to some random girls who liked me in the past.

I first met them in public settings like a shopping mall, arcade games, etc. I did try to observe some basic body language like , hair flipping, staring often, etc.

BUT this girls, did not show any body language I expected. They used to sit away from me , and acted normal, so I couldn't have the slightest clue they liked me.

So I was wondering if there is any subtle body language which is a best guide to find out if a random girl is attracted to me.

PLEASE BASE YOUR OPINIONS.. PEACE.