Texting a masked picture to a friend (on f.e. Snappychat ) might seem harmless....
But what most people don't realize is that you gave that social media platform certain permission for things...
So it might be that a picture without the mask the way your friends receive it, is stored as well to the database.
So it might be that a picture without the mask the way your friends receive it, is stored as well to the database.

You don't know what happens behind the fence with your pictures or data, always remember that!