make sure that you really need to add additional data and no existing can be used
data contains no personal information sufficient to identify a person (e.g., face, license plates)
there's no prominent trademark usage (e.g., a picture of traffic
that happens to include a Coke truck is okay, a picture solely of a Coke
billboard is not)
the content is appropriate (i.e. does not contain nudity, graphic violence or otherwise offensive or disgusting imagery)