I am sorry to say @jesus2099 but with one of the latest updates you must have broken something: On pages with many release groups not all cover art is loading anymore. I am using both the big pictures and the small pictures and today I have encountered two strange behaviours of your script that I have not seen before:
- Every time the page is reloaded different release groups are affected by missing cover art (browser console has a mix of 503 and CORS errors).
- Some release groups show both the small inline pictures and the big ones on top of the page, some display only one of them, some are missing both.
I did not have a look at the code yet, but maybe you are querying the CAA twice for each picture in the newer versions and this causes (some of) the problems? For debugging I can recommend this series as a test case which has over a hundred release groups with numbers on their covers, so it is very easy to spot the missing pictures 
