Sorry I was trying different code and above is not the code that I believe is correct.
This is it
$wp_customize->add_section('gwenty_images' , array(
'title' => __('Images', 'gwenty'),
'description' => 'Modify Images'
));
$wp_customize->add_setting('homepage_image' , array(
'default' => 'https://gwenty.com/example/wp-content/themes/gwenty/images/HalfShotbw.jpg',
));
$wp_customize->add_control( new WP_Customize_Image_Control($wp_customize, 'homepage_image' , array(
'label' => __('Edit Home Page Image' , 'gwenty'),
'section' => 'gwenty_images',
'settings' => 'homepage_image'
)));