Twitter image meta tag

Hi,

I was very glad to learn that the latest version unables the image meta tag in the tweets. I'm trying to modify the Twitter - Share tag I'm using in my blog article, so that when it's twitted, the teet is with the article image. I found a topic about twitter cards created earlier, but couldn't post my reply there. So I'm creating a new topic just to ask what is the correct code to add? I've tried both image=FULL_URL_TO_IMAGE and twitter:image=FULL_URL_TO_IMAGE - when I press this button, no image shows up. I've checked Configuration, Twitter Cards enabled, and I've chosen Summary Card with Large Image. I've checked Twitter Cards Validator - it works perfectly. Only the buttons inside the article (both JFBCOnnect easy tag and a third party sharing buttons) don't pick up the image
snowflakedesigns.co.uk/blog/la-vie-en-rose-quartz link to the blog article.
Please help!
Thank you.