Do you have a URL where this filter does hide stuff? Your filter is valid, so if it doesn't do what it's supposed to do, it's because it does not match any element on the page.
I randomly selected a page on goodreads.com, then typed
document.querySelectorAll('div[id="reviews"] img[class*="escapedImg"]') at the console, and an empty list was returned, meaning no element matches your filter.
I see user images on the page in the review section, but they have class
escapedImg. This means your filter should not work either in ABP.
goodreads.com###reviews img.gr-hostedUserImg work? (is it what you want?).
Side note: if your goal is to prevent lots of large images from being downloaded on that site, you could toggle on the blocking of large media elements on that site, and set the size threshold at say, 50 kB (I tried 50 kB, and no user image loaded). This also has the benefit that you can force a load of any of these blocked images with a single click if there is one which you think may interest you.