Template:File renaming non-reasons
As a matter of principle it's best to leave all files with generally valid names at their locations, even if slightly better names may exist. So for example:
|#||Criteria to decline||Examples (old name)||Examples (new name)|
|1.||Files should NOT be renamed only because the new name looks a bit better.||File:TowerBridge'09.jpg||File:Tower_Bridge_2009.jpg|
|2.||Files should NOT be renamed only because the filename is not English and/or is not correctly capitalized. Remember, Commons is a multilingual project, so there's no reason to favor English over other languages.||File:Rathaus_bremen.jpg||File:Bremen_town_hall.jpg|
|3.||If a filename in a local project conflicts with a filename at Commons, the file in the local project should be renamed. Renaming it at Commons would mean changing it in 700+ projects instead of just one.|
|4.||Files with copyright issues should NOT be renamed until copyright issues are resolved. There is no reason to rename a file if it is going to be deleted on copyright grounds.|
Additional naming conventions and exceptions from the above list might be discussed for specific projects.