Need To Change Image Size And Container Layout On Subcategory Page

[tztudio]

Hi,  I want to enlarge the size of my images and edit the container layout on subcategory pages.  I am attaching a jpg of what I am trying to do.  I am using a Template Monster template and Prestashop 1.6.1.1

 

I want the container box to be the same dimensions, but want the photo larger, and the item description, add to cart button and price a little lower.

 

Does anyone know which file I need to edit?

Thank you,

: )

T's Studio Jewelry