Sorry if this is something I really ought to know :/ 

Is there a standard form of words - either from OTRS wiki or that you have used - that is helpful when you are contacting organisations or individuals to ask for image donations? 

Context: I would like to contact artists to ask if they have image shots they would be prepared to donate to commons to support creation of articles about them. 

Problem: I need to be able to say a) What the benefit of donating the image is to them and to us b) what the consequences of CC-BY-SA donation are in terms of that images use for a non expert.

Also it would help if anyone can share the easiest process for managing uploading when you don't hold the copyright but the image donor does (but they are a non-expert/non editor)

Thank you!

Kat