Smiling during the times of failure is a virtue of great people! I am not one :O However, I don't get depressed either. I will try to assimilate it and get along with whatever needed to be successful in my next attempt.
Everytime you fail you are nearer to success. Usually I can't smile when I failed something, but it depends on the level of failure. My face don't lie, all my friends know my mood through my face. Cheer up! Smile soon