Hero
The hero item seems to be almost obligatory on a website's landing page. A hero is normally full width with a fixed height and uses a background image. Neither of these are desirable.
A background image cannot have alt text for the search engines and a fixed height doesn't perform well on mobile devices.
Images
The hero MUST have the image inserted in two sizes with a much smaller one for mobile devices. The images in the ThemeKit Responsive Hero widget shown above were reduced to 1200 x 800px and 720 x 480px and optimised before importing into EverWeb.
The images are inserted using the HTML5 <picture> element which allows an alt text attribute.
On browser/device screen widths above the breakpoint the image has a fixed height, Below the breakpoint the height becomes responsive using an intrinsic aspect ratio. The ratio can be set for both tablets and mobile phones.