There aren’t. Thanks for the suggestion. I’ve tried a bunch of different sizes, doesn’t seem to matter. I’ve also tried switching to the same theme as the default one on wordpress.com.
Maybe it’s an issue with the hosting provider? Not sure what to check there. The CDN appears to be disabled so that can’t be it. I guess I have to upload the images to another place and then paste the link.. seems like an unnecessary hassle though and it’d mean I wouldn’t get any traffic through google images.