My twitter cards don’t work properly. They go wrong in two ways:
Either they don’t work at all and when I check the post in the validator it says ‘exceeded 15.seconds to image-proxy while waiting for a response for the request, including retries (if applicable)’
Or they show my main picture plus multiple copes of the avatar from my google+ link.
I generally upload one picture to my blog and link across to Flickr for the rest.
My blog is sequinsandcherryblossom.com