Changing collection thumbnail size/shape and placement on page

Hi! I’m a beginner graphic design student trying to customize my storefront a bit and wondering if it’s possible within Shopify to change the shape, size and placement of the “Collections list page”.

This is what it currently looks like:

Wondering if it is possible to change the shape of the thumbnail from square to oval, and if I’d be able to place them out of the grid on the page. I don’t just want to change the thumbnail image in Shopify settings because it’s still inside the square grid. Maybe I could insert an image as a link to the collection instead of putting in the collections list at all? Would really appreciate feedback!

I’m wanting my final page to look similar to this:

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