google serp is very down of my website, keyword competition is low, url is 6 months old, content is unique, backlink is 132 but images in my website is duplicate. please tells about duplicate image issue in seo.
I think you should change images those are duplicate instead of wasting the time to get knowledge about this.
My site also have some duplicate images with no problem with panda/penguin update. What I did was just renamed all of download image with my promoted keywords by following "-' between words. I think you should concentrate more on any duplicate content there.