Two reisizes with image lib

[eluser]Unknown[/eluser]
Hello, I'm triying to make two resizes of four uploaded images. First I make a resize and later I make a thumbnail resize, at the first image all it's ok, but other three only make the thumbnail resize.

¿Could you help me, please?

This is the code of my controller:

Code:

function insertar()
    {
        $coche_id = $this->usuario_model->insertar_usuario($_POST);            
        
        $upload['upload_path'] = "./images/coches/$coche_id";
        if (!is_dir($upload['upload_path'])) {
            mkdir($upload['upload_path']);
        }
        $upload['upload_path'] = "./images/coches/$coche_id";                
        $upload['allowed_types'] = 'jpg';
        $upload['max_size']    = '1000';

        $this->load->library('upload');

        $this->load->library('image_lib');
        
        $i = 0;
        foreach($_FILES as $archivo)
        {
            $i++;
            if(!empty($archivo['name']))
            {
                $upload['new_name']    = $i.'.jpg';
                
                $this->upload->initialize($upload);

                if ( ! $this->upload->do_upload('fotos'.$i))
                {
                    $error = array('error' => $this->upload->display_errors());
                    
                    $this->load->view('usuario_nuevo', $error);
                }    
                else
                {
                    $this->redimensionar_foto($upload['upload_path'].'/'.$i.'.jpg');                                                    
                }        
            }
        }
        redirect("coche/ver/$coche_id");
    }

    function redimensionar_foto($source_image)
    {        
        $resize['image_library'] = 'gd2';
        $resize['source_image'] = $source_image;
        $resize['maintain_ratio'] = TRUE;            
        $resize['width'] = 560;
        $resize['height'] = 350;
        $resize['master_dim'] = 'width';

        $this->image_lib->initialize($resize);

        $this->image_lib->resize();

        $this->image_lib->clear();

        $this->thumbnail_foto($source_image);
    }

    function thumbnail_foto($source_image)
    {    
        $resize['image_library'] = 'gd2';
        $resize['source_image'] = $source_image;
        $resize['maintain_ratio'] = TRUE;            
        $resize['width'] = 140;
        $resize['height'] = 105;
        $resize['master_dim'] = 'width';
        $resize['create_thumb'] = TRUE;
        $resize['thumb_marker'] = 'th';

        $this->image_lib->initialize($resize);

        $this->image_lib->resize();    

        $this->image_lib->clear();
    }