I could not get pictures to work using the documentation listed on page 40.
Found that both the text and the picture give samples as "username.jpg". I got mine to work by removing the ".jpg" The sample that is shown under "C:\Program Files\lansweeper\website\userpictures\netbios name of your domain" on my server is listed correctly but not in the documentation.
If I am right then the dcoumentation should be corrected.