I wish it was possible to add images in the notes section for items. I just found this irasutoya pic on google when looking up 忠誠 (loyalty) and I really wish I could attach it to the flashcard!!
I’m not sure it’s a good illustration for loyalty though…
Being loyal to someone doesn’t mean tolerating abuse… 
But yeah, I quite agree that adding user images as notes would be cool…
However, it would also put a significant load on the storage servers…
Maybe, if, unlike Discourse (which downloads every image you post onto its own servers), WK would allow to store links to images located on other servers, this might solve this problem…
