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WordPress

WP Customizer - Image not showing

Hi,

I'm trying to setup a WordPress Customizer. I can bring slogan to display as well, but when I tried to add image background via Customizer, it is not showing and always return a blank value when viewing source:

<style>
    .main-content {
        background-image: url("");
    }
</style>

Here is my code:

header.php

<head>
    <?php if(is_post_type_archive('album')) { ?>
        <style>
            .main-content {
                background-image: url("<?php echo get_theme_mod( 'album_bg' ); ?>");
            }
        </style>
    <?php } ?>
</head>
<body>

inc/customizer.php

function mhs_sanitize_image( $image, $setting ) {
    /*
     * Array of valid image file types.
     *
     * The array includes image mime types that are included in wp_get_mime_types()
     */
    $mimes = array(
        'jpg|jpeg|jpe' => 'image/jpeg',
        'gif'          => 'image/gif',
        'png'          => 'image/png',
        'bmp'          => 'image/bmp',
        'tif|tiff'     => 'image/tiff',
        'ico'          => 'image/x-icon'
    );
    // Return an array with file extension and mime_type.
    $file = wp_check_filetype( $image, $mimes );
    // If $image has a valid mime_type, return it; otherwise, return the default.
    return ( $file['ext'] ? $image : $setting->default );
}

function mhs_customize_register( $wp_customize ) {

    if ( ! isset( $wp_customize ) ) {
        return;
    }

    // Adding default setting
    $wp_customize->add_setting("mhs_default_slogan", array(
        "transport" => "postMessage",
    ));

    // Remove default sections
    $wp_customize->remove_section( 'static_front_page' );

    // Adding section and setting
    $wp_customize->add_section( 'mhs_frontpage' , array(
        'title'    => __( 'Frontpage Setting', 'mhs' ),
        'priority' => 80
    ));
    $wp_customize->add_control('mhs_slogan', array(
            'label' => __( 'Slogan', 'mhs' ),
            'section' => 'mhs_frontpage',
            'settings' => 'mhs_default_slogan',
            'default' => 'This is a slogan',
            'type' => 'text',
    ));

    $wp_customize->add_section( 'mhs_background' , array(
        'title'    => __( 'Background Setting', 'mhs' ),
        'priority' => 90
    ));

    $wp_customize->add_setting( 'default_bg_image' , array(
        'default' => 'wp-content/uploads/11/4.jpg',
        'transport' => 'refresh',
    ));

    $wp_customize->add_control( new WP_Customize_Upload_Control( 
        $wp_customize, 
        'album_bg', 
        array(
            'label'      => __( 'Album Background', 'mhs' ),
            'section'    => 'mhs_background',
            'settings'   => 'default_bg_image',
                'priority'   => 1
        )
    ));

}
add_action( 'customize_register', 'mhs_customize_register');

function mhs_customizer_live_preview()  {
    wp_enqueue_script("sitepoint-themecustomizer", get_template_directory_uri() . "/js/theme-customizer.js", array("jquery", "customize-preview"), '',  true);
}
add_action("customize_preview_init", "mhs_customizer_live_preview");