I don't like how some images look, how can I restore or re-optimize them?

If you notice that some of your images are pixelated/blurry, then you can go to your Media Library, switch to List View and look for the image(s) that look bad:

On the right side of the image row you'll see these options:

We recommend you to try first to re-optimize the image as Glossy, as usually this fixes the issue. In the very rare cases when this doesn't happen, then you can also try Lossless.