One of the first things you may want to do when creating a custom Genesis child theme from scratch is add the header image.
Adding this chunk of code…
/** Add support for custom header **/ add_theme_support( 'genesis-custom-header', array( 'width' => 960, 'height' => 100 ) );
…will add a new tab called “Header” underneath the “Appearance Tab”. There you can upload the image file for the website’s header.
Note: If you change the width and height of the header image, you may have to change the header css to adjust the change.