PImage woman;
String[] myImages = new String[25];
int i = 0;

void setup() {

  for (int i = 0; i < myImages.length; i++) {
    myImages[i] = "female" + (i+1) + ".jpg";
  }
  size(720, 480);
}


void draw() {
  // loading an image
  woman = loadImage(myImages[i]);
  // draw the image to the screen
  image(woman, 0, 0);
  delay(5000);
  // i is cycling through the images in linear fashion
  //i = (i+1)%myImages.length;
   i = int(random(myImages.length));
}