Computational Portrait

let img;
let min, max;

function preload() {
  img = loadImage('https://i.imgur.com/Wup8Ien.jpeg');
}

function setup() {
  createCanvas(480, 480);
  min = 4;
  max = 40;
  imageMode(CENTER);
  noStroke();
  background(255);
  img.loadPixels();
}

function draw() {
  let randomVal = map(random()*300, 0, width, min, max);
  let x = floor(random(img.width));
  let y = floor(random(img.height));
  let pix = img.get(x, y);
  fill(pix, 128);
  triangle(x, y, x+randomVal, y, x+randomVal/2, y+randomVal);
}