Images on your public site now look sharp on retina and high-resolution screens everywhere, not only the photos you've uploaded yourself. Images that came with your site template, like the Why Rent cards, the homepage credential photo and the About page story image, now load in crisp versions sized to the space they fill. Package thumbnails, testimonials and team photos get extra-sharp versions for high-resolution phones and laptops too.
The banner at the top of your pages also gets a high-resolution version on retina screens, whether you're using the default banner or your own image. There's nothing to change on your end: your existing images are upgraded automatically.