As I interpret it, it’s more about what the client’s site is or does.
Finding non-Editorial Images:
Just click “Refine Your Search” next to the search bar. Checking the “Editorial” or “Non-Editorial” box will filter Images according to your needs.
There are a few recommendations for free photos in this topic:-
Generally CC photos are OK, but read the license agreements to see if they allow commercial use.
You can also filter Google Images results by Usage Rights, if you click the Tools button.
If you (or the client) are willing to pay I would think the choice is much wider.