Take a look at the knees. The student model has polys that appear to be vertacle and the character studio mesh around the knees has some sort of angled lines in them. If the mesh is different, then that could be an indication of at least some sculpting. The sleeve and chest mesh also appears to be different, most noticably around the shoulders. There's angular mesh on her model and strait mesh on the character studio one. The hair mesh is more refined on the character studio image than it is on the student model. The face does bear a striking resemblance. I don't know if your student made that by looking closely at the original and doing the same thing (such as someone projecting a slide on paper and drawing a portrait that way) or if she took the model and hacked it a lot. While I'm not a mesh expert, it appear to me that these are not identical cut and paste meshes. If you were to overlay the two wire images, you could see the differences better. Also, the idea about the programmer notes is a good one. Might want to open the mesh file in a text editor and do some reading.