I have just optimized all images on my site using WP Smush

Hello, I have just optimized all images on my site using WP Smush Pro.
I did not use Super Smush option. However, I have noticed a rather obvious degradation in image quality, especially on mobile view. My website features photography of furniture and a lot of the product images feature woodgrain that now looks blotchy and uniform - finer details are lost. As I understand Smush is 100% loseless. Could this be attributed to Smush?

Prior to optimizing images with Smush I have also enabled a caching plugin W3 Total Cache. Maybe that has something to do with it? Just trying to figure it out... I have now disabled caching but not seeing a difference.
Thank you.