how to change Vintage theme "Blog Image" display on Front page

Hi Easyblog team,
I am really a fan of your module.
I want to know how to change Vintage theme "Blog Image" display on Front page.
Please check my blog on my site at this link - http://cormino.com/Cormino-Blog/Latest.html
As you can see the - the 1st blog post for "Amazon Fire Phone" I have enabled Blog Image display.
And I know that as per Vintage theme, it will be displayed like this. Because the image is 100% width.
But I want it to be displayed like this link - http://cormino.com/cormino_demo1/index.php?option=com_easyblog&view=latest&Itemid=974
In this link the Blog Image is displayed exactly as I want.
I know it is elegantred theme.
But I have done all the changes in Vintage theme and if I switch themes now, I will have to customize everything again, starting from text size etc...
So, I just need to know at which folder I have to change and what codes to use.
I only need to change the "Blog Image" display in front page similar to elegantred.
I am new to software development, so need your urgent help.