Image previously shared on Google+. I'm not sure if Google is tinkering with Picasaweb/Google+ interactions or not. A week or two back, my previous method of sharing ceased to work (I thought). Now it appears to be working again. The secret, as far as I can tell, is not to be logged in to Google+ when you want to embed images outside Google+. If you're not logged in to Google+, you'll find a link in Picasaweb that says "embed". That produces the code you need to embed an image stored in Picasaweb in another web site.