I smushed pics already on my blog, but they are still washed out

Hi.

My pictures were correctly optimized with EWWW Image Optimizer .
I disabled it and my pics went washed out
I downloaded your WP Smush plugin and started Smush my photo library.
But my pics are still washed out on the blog.
You explicitly says that Smush it will optimize pics already on the blog.
What's going on?

Best