Just an extra thought on this subject... it's always good to document the source of any photo, document, or information for your own use later in case some alternate information comes in to play. That way it can be rechecked to determine correct info if possible.
Also... my own thought is that there are getting to be so many photos added ... how many of them may be connected to the wrong person? Considering how many trees have linked incorrect people from other trees, it would stand to reason that photos may also be appearing on some people that may not be correct. Documents are generally fairly easy to confirm, but photos are a bit "iffy".