Where do screenshots go?
Solution 1:
For Windows users: C:\Users\<Your Username Here>\Documents\Diablo III\Screenshots
For Mac users: <Your Username Here>/Library/Application Support/Blizzard/Diablo III/Screenshots (caution: it's a hidden folder)
Solution 2:
On my system it's C:\Users\username\Documents\Diablo III\Screenshots. So presumably it's under the Documents\Diablo III\Screenshots or the appropriate variant on all Windows systems.