Does the absence of a smile on the face of a martyr after his death mean that he did not see his seat in Paradise, unlike those who smile, which would suggest they did see their seat in Paradise?

This is among the unseen matters about which certainty cannot be attained except through a religious text. Therefore, one must be keen to harbor good thoughts about all Muslims, and to pray for mercy, supplicate, and seek forgiveness for them, and to focus on the righteousness of the living.