The easiest and quickest way that you can do this is by downloading the Comment Images plugin and limit access to the upload feature by the function current_user_can. As the WP page demonstrates, use:
if ( current_user_can('manage_options') ) {
// Plugin code here
}
I had a very quick look at the plugin code and you may need to add this function to the add_image_upload_form function. All and all, this should only take you a few minutes to setup.