Screen sharing app may be worth a try

Looks like it might be worth a try. Could even work as a homework assignment where students could collaborate in real time at home, in the dorm, the library, etc..  They could then share their page with the teacher. Imagine collaborating on annotating a photo or other visual primary document?

http://www.tuaw.com/2013/10/14/share-anytime-is-a-clever-collaborative-whiteboard-app-for-ipad/