By default, player's photos are set to be their initials on a colourful background. These photos can be changed to a photo of he player. To do this:
1. Go to the Roster tab
2. Click on the Player's Name you'd like to change the photo for
3. Click 'Edit'
4. Click on the Photo at the top
5. Take a photo or click 'Select from Gallery'
You will then see the new photo you selected
This change will also be reflected on the roster page.