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Normally I don't do it and I try not to be in people's faces. I don't want to make anyone feel uncomfortable. But it's all about the energy - when I'm positive and want to take a genuine photo cause I like the moment, then I trust the feeling is conveyed and the other person sees it as a sign of playfulness and gratitude. It's all about the photographer's intent.

Energy, the positive state of mind, and the moment, all make sense and should produce great results which is evident from your shots. Thanks, these will be of help to me.