Try to flip the Robots but not the Gravatars

Hello,
first of all: Thank you for this great and cute Plugin. I love the Robots ??

My problem: I would like to flip the robots horizontal. I know how to do it with css. But when a user has a Gravatar-Image I don’t want to flip this image. I tried out some code but nothing worked. In your JS-File I tried to include:
ctx.translate(width, 0);
ctx.scale(-1, 1);

But no succsess ??

At the moment I handle it for user “Cheyenne” like this:
$(‘img[alt=”Cheyenne”]’).removeClass( “avatar” ).addClass(“cheyenne”);

(In my own JS-File)
But this is not a solution for other Gravatar-Users ??

If you could give me a hint how to solve this, I would be very thankful.
All the best,
Isabelle

The page I need help with: [log in to see the link]