Hey people, im a bit stuck with a work for college... I need to make a program that prints in screen 3 random parts of the peoples faces. Ive managed to get it working till the random part, cause it only prints in order. The code as far as i have it is in the end. Plese help me, not only im a noob, but this is a very important work for my semester! Thanks in advance and sorry for the english, not my mother tongue :)

PImage imagen_01; 
PImage imagen_02;
PImage imagen_03;

int posx = 0;
int posy = 0;

int ancho = 1920;
int alto = 360;

int azar =0;

String [] nombreImagen = {"ojos-0001.jpg","ojos-0002.jpg","ojos-0003.jpg","ojos-0004.jpg","ojos-0005.jpg","ojos-0006.jpg","ojos-0007.jpg","ojos-0008.jpg","ojos-0009.jpg","ojos-0010.jpg","ojos-0011.jpg","ojos-0012.jpg"};

void setup() {
  size(1920, 1080);

  println(nombreImagen);
  azar = int(random(3));
  println(azar);
  //nombreImagen[].add = cargar imagen dinamicamente de la carpeta XXXXX;
  imagen_01 = loadImage(nombreImagen[azar]);  // Load the image into the program 
  imagen_02 = loadImage(nombreImagen[1]);
  imagen_03 = loadImage(nombreImagen[2]);
  noLoop();  // Makes draw() only run once
}

void draw() {

 copy(imagen_01, 0, 0, 1920, 360, 0, 0, ancho, alto);

 copy(imagen_02, 0, 360, 1920, 360, 0, 360, ancho, alto);

 copy(imagen_03, 0, 720, 1920, 360, 0, 720, ancho, alto);


}