Google’s John Mueller said on a hangout last week that when it comes to images, he thinks it is worthwhile to have unique images on each of your pages. If you have the resources, making your own images, instead of using blanket stock photography, should help with image search traffic and maybe the one box image results.

John did add that it doesn’t help you rank directly with web search, but overall, it is still good to have.

John said at 31 seconds in:

So either do your own photography or take images and mash them up into something unique, if possible.

Forum discussion at Google+.