Both you and your student have the ability to change your profile picture in Schoology. This helps to put a face with a name.
To change your profile picture:
Click on your profile in the top right hand corner of the screen.
Select Your Profile.
Hover of the blue image in the top left and click edit picture.
Attach a file from your computer.
Click the X to close the box.
See the .gif below for a visual of how this is done.