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Hi Mark! When writing blogs for our clients I make the photo link to "none" UNLESS it is a brand logo or something of the like that can link to the brand/manufacturer's website. I find that this could negatively impact the user experience if they click the photo only to realize it brings them to a webpage that only shows the image. The most important information when adding a photo is the ALT tag. This lets the crawlers know what the image is of. If I were you, I would ensure all the photos being added have an image ALT tag but do not link to just the image file to ensure positive user experience. Hope this helps!