Here's Jean Harlow, 26 years old, on the set of Saratoga, minutes before she collapsed.

https://upload.wikimedia.org/wikipedia/commons/thumb/e/e6/Jack_Conway_Jean_Harlow_Clark_Gable_Saratoga_1937.jpg/800px-Jack_Conway_Jean_Harlow_Clark_Gable_Saratoga_1937.jpg

Without this preamble, no one looking at this image would think she was anything but a happy, healthy, young woman. Be kind - even when someone is smiling, you don't know what they're dealing with, what burdens they are carrying, what's going on inside, behind the smile.