Tznius is about covering our ego and developing our internality. Do we compromise this when we do mitzot in a showy way? The great people hid their great levels of learnng and piety in order not to attract attention. Of course, there are times and places where we shoud 'show what we know' and do external acts in order to inspire those around us to grow. What is your kavana? Is Hashem your number 1 audience or are you out to impress yourself and others!