Product photos very poor res

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Hi: I'm using Atlantic Lite theme for my Shopify site and although we get high-res images and save them for web on Photoshop the resolution is always pixellated on the web pages. We switched theme several months ago, and this was never an issue. Also pagination on the home page for our Instagram feed is squashed and we can't resize our Blog images in the way we'd like. The look and feel of this theme is good but the fomattting is not working in way we'd like. Any constructive help would be greatly appreciated. Many thanks