Customize WooCommerce Product Images (Placement and size)

so I’m having trouble trying to re-size my product thumbnail images. The site can be seen here : http://www.seekoften.com/eCommerce .

I’d like the single-product page to have square thumbnails below the large featured image, but I also want the thumbnails that show in the cart (both on the page, and the sidebar cart widget ), to be vertically oriented, like the featured images, just a scaled down version of it. What files and which loops or lines of code should I look at, and how do I go about accomplishing this ?

As a secondary question, how can I customize the output so that it shows the product images that you have in your cart, but on the checkout page ( again, preferably the large vertically oriented image ) ?

For what it’s worth, I have plugins like regenerate Thumbnails and Simple Image Sizes

I would greatly appreciate any help that anybody is willing to offer, and would like to thank you all in advance for reading this at all 🙂

Cheers,

Sincerely,

Chris “Fawkz” Coffin