Jaikoz 3.8.3 prerelease and earlier.
Often it happens that an Artwork from Amazone is not included correctly in Jaikoz.
If I use on the Contextmenu ViewOnline -> View Artwork Full-size I get a Artwork-window with a yellow exclamation mark.
In the Detail Pane -> Artwork I can see the right Artwork.
Then I have to use Ctnl+L to go to the release in MusicBrainz. There I can see, that there is an artwork in Amazone. Then in Amazone I can get the Artwork in the right (big) size.
Example release: The Colpix-Dimension Story (Disc 2)
MBID: \tee74db10-99e8-479f-b8c8-5fb63e4496bf