PHP help: showing featured image on pages

[balletuni]

I want to show featured image thumbnails on pages (to appear before the page title and content), but only if there is a featured image defined for that page (otherwise, I don't want any image to appear above the page title).

With the code below, I get the desired result. However, it kills the featured image thumbnails on my archive pages and on my posts...
add_action( 'genesis_before_post_title', 'genesis_post_info' );
add_action('genesis_post_title','generate_post_image', 5);
function generate_post_image() {

if ( is_page() || ! genesis_get_option( 'content_archive_thumbnail' ) )
return;

if ( is_page() && has_post_thumbnail() ) {
printf( $image );
} else { return;
}

if ( $image = genesis_get_image( array( 'format' => 'url', 'size' => genesis_get_option( 'image_size' ) ) ) ) {
printf( '<a href="%s" rel="bookmark"><img class="post-image" src="%s" alt="%s" /></a>', get_permalink(), $image, the_title_attribute( 'echo=0' ) );
}
If I remove this portion...
if ( is_page() && has_post_thumbnail() ) {
printf( $image );
} else { return;
}
...then my archives and posts look perfect, but I am back to where I started with no featured images on the pages.

What am I doing wrong? My website is: http://www.balletuni.com

[balletuni]

Actually, this portion from the above code kills the desired result of featured images on pages:

if ( is_page() || ! genesis_get_option( 'content_archive_thumbnail' ) )
return;

So this is the code that gets the desired result:

add_action( 'genesis_before_post_title', 'genesis_post_info' );
add_action('genesis_post_title','generate_post_image', 5);
function generate_post_image() {

if ( is_page() && has_post_thumbnail() ) {
printf( $image );
} else { return;
}

if ( $image = genesis_get_image( array( 'format' => 'url', 'size' => genesis_get_option( 'image_size' ) ) ) ) {
printf( '<a href="%s" rel="bookmark"><img class="post-image" src="%s" alt="%s" /></a>', get_permalink(), $image, the_title_attribute( 'echo=0' ) );
}

}

...except that it kills the thumbnails on archives and posts.

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