It’s never a good idea to share other images “claiming yours” better give a proper courtesy! Anyway, there might be many ways how people find out that you copied the image and posted, but here we will let you know the simplest one. This might also work the reverse way; meaning if others have posted your images on their sites or so on!
STEP I : Go to google.com
STEP II: Click on images (Extreme right, top)
STEP III: Click on the small camera icon >> the Upload an image >>Browse the photo >>
STEP IV: Here you go; you will find the links to the images 🙂
P.S. Next time you download other photos and post it on the web thinking no one will know about it; please don’t fool yourself!