how to create animation using p5.js how create an animation of process of blast furnace

i have loaded images using p5.js but how to perform transition and movement of images for the duration.i am adding up the code here. i have to create a working animation for blast furnace using images.i have used images as variables

var pic2
var pic3
var pic4
var pic5
let posX=0
let posY=0
let size=200
function preload(){
 // pic1=loadImage("blastF1.png")
  pic2=loadImage("iron.png");
  pic3=loadImage("blast3.jpg");
  pic4=loadImage("slag.jpg");
  pic5=loadImage("BLAST2.jpg")
}


function setup() {
  createCanvas(600, 500);
 
}

function draw() {
  background("grey");
 // image(pic1,0,100,100,200)
//  image(pic2,posX,posY,size,size-20)
  image(pic3,posX,400-posY,200,200)
  image(pic5,posX,0,200,300)
  //image(pic4,0,0)
  if(posX>width||posY>height){
    posX=0
    posY=0
    size=100
  }else{
  posX+=1
  posY+=1
  size-=0.15}
  
}