Upload user pictures
From MoodleDocs
Location: Administration > Users > Accounts > Upload user pictures
The Upload user pictures feature enables administrators to upload a zip file containing user images.
- The image files should be named after the username, the idnumber or the id of the student (along with the correct image file extension.) For example, a student with the username jbrown98 would have a picture called jbrown98.jpg
- Image types supported include gif, jpg, and png.
- Image file names are not case sensitive.