Changing style of category page

Hi there,

I’m trying to change the way my blog looks on category pages like this one:
http://www.writingrevolt.com/category/freelance-writing-tips/

I don’t want the blog post images to show as small circles – I want the blog post images to be larger than that, like how they are on my home page:
http://www.writingrevolt.com

Is there a way to edit the look of how blog posts are listed on my Category pages in Highend? Or a workaround I can use to have the blog posts listed normally and not with small circle images?

Also, are there other options for ways the blog posts can look when multiple are listed on one page? I’d love to have a medium sized picture on the left and the Title/excerpt on the right if possible.

Thank you!