While uploading a profile picture, one might have to go through an entire process of strategising and planning to choose from amongst the best choices they are provided with. In short, they give a lot of thought to it, and when one spends so much time on a decision, it is ought to say a lot about them.
Here is what you can learn about someone's personality by looking at their profile picture.
People who use brighter, colorful and more natural pictures tend to have a vast array of personalities. Generally, they have the habit of doing what is expected of them.
Their pictures are simply the best having very sharp and high contrast. Unusual along with being artistic, they want to experience everything.
People who have a lot of people in their profile picture means they are extroverts.
...show neuroticism. They generally use pictures which are simple and have fewer colors.
They might have not so appealing snaps as their profile picture, but even then they are always smiling. They are agreeable to almost anything.