You really captured the effect quite well. Nice work!

Perhaps you can add some splotches?

Code Example

1. void setup() {
2.   size(500, 500);
3.   background(255);
4. }
5.  
6. void draw() {
7. }
8.  
9. void mousePressed() {
10.   colorMode(HSB, 360, 100, 100, 100);
11.   fill(random(150), random(20, 60), random(20, 60), random(50,100));
12.   noStroke();
13.   for (float i=3; i<29; i+=.35) {
14.     float angle = random(0, TWO_PI);
15.     float splatX = mouseX + cos(angle)*2*i;
16.     float splatY = mouseY + sin(angle)*3*i;
17.     ellipse(splatX, splatY, 17-i, 17-i+1.8);
18.   }
19.   colorMode(RGB, 255, 255, 255, 255);
20. }

many thanks,
I will try this.

guillaumeloiseau.com