Google share thumbnail

I can’t for the life of me figure this one out.. When I click the google+ share icon on the left of the page it gives me the image with the guy holding up the globe, i want it to be the camel. All of the other share icons use the camel, just not google+. I deleted every possible trace of that guy holding the globe image to no avail.

How can I make the camel my main thumbnail for the google+ sharing?

http://caffeinecamel.com