If you have images on your website that are likely to change (e.g. have a different watermark), but the same image name, should you add version information to the end of the image name, or would this be bad for SEO purposes?
I have an issue where we have changed the watermark on a number of images 5 months ago, but Google Image search still shows the old watermark on the images. So I am assuming that Google hasn't downloaded the new images as the filenames are the same as the old ones.