When 'sharing' to Facebook, the shop logo appears and not the product on the page.

[Holiday_Swagg]

When 'sharing' to Facebook, the shop logo appears and not the product on the page.

A few times, I've shared prodcuts from my iPhone, to my FB page and the product will show up. Now on my iPhone and computer, the shop logo is what is showing up.

THis is what I'm looking to accomplish: The post with the shirt to the left:
https://www.facebook.com/holidayswagg/ 

Now All I get is the logo? Show on line below and labeled 'Incorrect Post Showing: Should have product Image'
https://www.facebook.com/holidayswagg/ 

I'm tried a 'sharing' and 'posting' options, non of which, show the product they all show the logo or just text. 
Any help would be greatly appreciated.