Comment by zozbot234

IME, there's basically no correlation between your facial expression and whether you respect and work well with others. Someone who just smiles at you all the time is going to either seem nutty, or at best look like he's being really nervous and trying to find humor in the interaction somehow. It's a sign of weakness and might make others take you less seriously. On the flip side a firm expression and stiff upper lip can also connote respect for others.