You can always change the picture in your profile by doing these:

(Mobile):

1. On the "Left Navigation Tray" click your current profile picture (On desktop mode profile picture will be on the bottom of the navigation tray)
2. After clicking on your profile picture, your profile shall appear
3. Click on Edit on the top right of your profile screen
4. Click on the silhouette or current profile picture
5. Follow the instructions to choose photo from your phone or remove the current photo

(Desktop): 

1. Click on your profile picture in the left navigation tray 
2. After clicking on your profile picture, click Change Profile Photo
3. Then, choose a photo to upload from your computer.
4. Finally, click Open and your profile will update.