Why don't ordinary people laugh in artistic photography?

"Laughter" itself is a kind of "mask". A mask used to hide true feelings. Everyone will have this experience. When someone else's camera suddenly points at you, you will laugh instinctively and even compare your hands with "yeah". But are you really happy at this time? "Laughter" and "yes" are just a kind of protection for your true feelings. Who wants to expose their true selves to a precise lens, right? Although the smiling photos look harmonious, there is no real emotion in essence. And art is based on truth, and it is higher than truth. Art is expression, and photography is a way of expression. What we see are artistic photos, and I don't think they are cold or artificial. Just as one of the elements of expression. Serve the whole photography work. It may be because they don't smile and look real that artists choose them as their roles, or it may be that their real appearance touched artists and artists wanted to record them. So, this is why most of the characters in artistic photography we see don't laugh.