Matt Cutts explained emphatically that using stock photos (or even duplicating photos repeatedly on the same site) does not impact your search engine ranking, negatively or positively.
While this question was put in the context of stock photos, the implications for photographers and artists clearly go beyond that. For example, if an infringer copies and posts a copy of a photo on their site, it doesn’t hurt the ranking of the original photographer and their site.
So while the good news is that legitimate sites won’t be penalized when their images are infringed, the flip side is that infringing sites won’t either. All of the sites that lift photos have the exact same chance for ranking well, including in Google Image Search, that your site does.
Though, for writers, Google sometimes gets it wrong and unfairly penalizes original sites, it gets it right most of the time and keeps the plagiarists out of the search results.
How to deal with duplicate image and site content?
Google’s “Search by Image” is based upon the COLOR PROFILE of the image. Changing the color, adding other elements to the image or reversing the landscape works.
duplicate image (or slightly modified image) is ok, make sure other content within page is unique AND still relevant to that image.
To avoid the duplicate image penalty comes in potential inpact totally, use unique images or photos of your products, brand and employees. Stock photos sometimes also means untruthful, cuz they make your audience feels not real.
Some duplicate or similar images may be beneficial to your site. For example, having an image or photo of a coffee cup that Google feels is similar to coffee on a website for a coffee shop is helpful.
Optimize all your images and other multimedia on your site.
Other duplicate or similar images on your site that represent branding or trust are good, such as having Visa, Mastercard or the Better Business Bureau images.