You can adjust your home page images' focal point to control exactly how they're cropped for different layouts, aspect ratios, devices.
1. From your "Content" section of your control panel, click on your Home Page.
2. Click the small "target" button in the corner of the image you'd like to adjust
3. Next, click the image where you'd like to set its focal point. Your site will do its best to avoid cropping this point.