Use is_home() if using a static front page in the reading settings and not the default.

Add Image Before Loop Blog Page Genesis.php

/**
* @author Brad Dalton - WP Sites
* @example http://wpsites.net/web-design/code-snippets-for-adding-custom-functions/
*/

function image_before_blog() {
if(is_page_template(page_blog-php) )
    echo '<div class="custom-image">Add Your Images HTML Here</div>';
};
add_action('genesis_before_loop', 'image_before_blog');