It's not only with smiling. It's about how you speak (vocal tonality), how you stand (body language). The enthuasim you have.
For example, I'm very energyzied. I hi-5 people at my work place. I say, "smaaaack it!" to collegues. I sing. I spread energy
I would suggest that you ask one of those people to video shoot you on their mobile device and let you judge for yourself. I'm sure you will say "whaaaat the fuck? is this me? i do thaaaaaaat sutff?"
I am doing it to myself while learning pickup. It gives you an amazing perspective on how you look from the side and what your subcommunications are.
s-man,
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