WP Smush Image Optimisation Fail

Hi

I tried WP Smush image optimisation, and after 50% of image optimisation I see that a part images on my site have a very low quality, and I m very disappointed about that, compression of images is not about losing their quality its about optimisation
the photo from this post for example http://voloshin.md/ny/ all of them are with very low quality

can I return to my original photo?