// make the nopic.jpg update possible via child theme.
    if ( ! function_exists( 'TaskerDev_get_first_post_image_fnc' ) ) :// I am using this to overwrite the parent action.
    
     /*************************************************************
    //*
    //* TaskerDev (c) sitemile.com - function
    //*
    **************************************************************/
    function TaskerDev_get_first_post_image($pid, $w = 100, $h = 100)
    {
        $img = TaskerDev_get_first_post_image_fnc($pid, $w, $h);
        $img = apply_filters('TaskerDev_get_first_post_image_filter', $img, $pid, $w, $h);
        return $img;
        
     }
    /*************************************************************
    //*
    //* TaskerDev (c) sitemile.com - function
    //*
    **************************************************************/
    
     function TaskerDev_get_first_post_image_fnc($pid, $w = 100, $h = 100)
    {
        
        
         
        //---------------------
        // build the exclude list
        $exclude = array();
        
         $args = array(
        'order'          => 'ASC',
        'post_type'      => 'attachment',
        'post_parent'    => $pid,
        'meta_key'       => 'another_reserved1',
        'meta_value'     => '1',
        'numberposts'    => -1,
        'post_status'    => null,
        );
        $attachments = get_posts($args);
        if ($attachments) {
                foreach ($attachments as $attachment) {
            $url = $attachment->ID;
            array_push($exclude, $url);
        }
        }
        
        //-----------------
    
        $args = array(
        'order'          => 'ASC',
        'orderby'        => 'post_date',
        'post_type'      => 'attachment',
        'post_parent'    => $pid,
        'exclude'           => $exclude,
        'post_mime_type' => 'image',
        'post_status'    => null,
        'numberposts'    => 1,
        );
        $attachments = get_posts($args);
        if ($attachments) {
                foreach ($attachments as $attachment) 
                {
                //$url = wp_get_attachment_url($attachment->ID);
                return TaskerDev_wp_get_attachment_image($attachment->ID, 'thumb_image_thing');   
             }
        }
        else    return get_bloginfo('template_url').'/images/nopic.jpg'; // wanna replace with: return get_stylesheet_directory_uri().'/images/Picture16.jpg';
    }
    /*************************************************************
    //*
    //* TaskerDev (c) sitemile.com - function
    //*
    **************************************************************/
    endif;
    
     ////end

I have updated by deleting some redundant options.

    if ( ! function_exists( 'TaskerDev_get_first_post_image_fnc' ) ) : 
            function TaskerDev_get_first_post_image_fnc($pid, $w = 100, $h = 100) {
                            
                //---------------------
                // build the exclude list
                $exclude = array();
                
                $args = array(
                'order'          => 'ASC',
                'post_type'      => 'attachment',
                'post_parent'    => $pid,
                'meta_key'       => 'another_reserved1',
                'meta_value'     => '1',
                'numberposts'    => -1,
                'post_status'    => null,
                );
                $attachments = get_posts($args);
                if ($attachments) {
                        foreach ($attachments as $attachment) {
                        $url = $attachment->ID;
                        array_push($exclude, $url);
                    }
                }
                
                //-----------------
            
                $args = array(
                'order'          => 'ASC',
                'orderby'        => 'post_date',
                'post_type'      => 'attachment',
                'post_parent'    => $pid,
                'exclude'           => $exclude,
                'post_mime_type' => 'image',
                'post_status'    => null,
                'numberposts'    => 1,
                );
                $attachments = get_posts($args);
                if ($attachments) {
                    foreach ($attachments as $attachment) {
                        //$url = wp_get_attachment_url($attachment->ID);
                        return TaskerDev_wp_get_attachment_image($attachment->ID, 'thumb_image_thing'); 
                    }
                }
                #else   return get_bloginfo('template_url').'/images/nopic.jpg'; 
                else    return get_stylesheet_directory_uri().'/images/Picture16.jpg';
            }
            /*************************************************************
            //*
            *   TaskerDev (c) sitemile.com - function
            /
            *************************************************************/
        endif;