You can use this code to get the wordpress backend theme option selected images.
PHP File
// Favicon
$website_favicon_array = wp_get_attachment_image_src(get_option('theme_options_website_favicon')[0], '');
$website_favicon = $website_favicon_array[0];
// Header Logo
$header_logo_array = wp_get_attachment_image_src(get_option('theme_options_website_logo')[0], '');
$header_logo = $header_logo_array[0];
// Footer Logo
$footer_logo_array = wp_get_attachment_image_src(get_option('theme_options_website_footer_logo')[0], '');
$footer_logo = $footer_logo_array[0];