iTunes store does not display my cover art

The image which appears in the Store is referenced in the feed; but the images which appear when you subscribe and select an episode are not - they have to be actually embedded in the episode's media file. Please see this page for full details:

http://www.wilmut.webspace.virginmedia.com/notes/coverart.html

It does work OK but you have to actually start playing the episode before it appears in the small area at the top of iTunes 11 - click that and you get a larger version. This appears to be a change in iTunes 11.

I'm not sure what you're expecting to see. When playing the episode on subscribing, the image shows:

and doing a 'get info' confirms that it is the same image. I downloaded the file from the link in your post above and checked the tags:

- same result (as you'd expect). If you were expecting to see something else, it's not anywhere to be found.

That's normal - in iTunes 10 the image which appear in Cover Flow was that of the top episode in the list, and the equivalent is happening here. The podcast image in the feed does not appear anywhere when subscribing.

Only you can decide whether you want individual images for the episodes or an overall one - you may feel that individual images add a little extra to it, and I don't think it will worry subscribers.

Podcasts with chapters and an image for each chapter have to be 'enhanced' and m4a, you can't do it with mp3. If you would like to see it in action, you could subscribe manually (from the File menu in iTunes 11 or the Advanced menu in 10 and earlier) to my podcast:

http://rfwilmut.net/podcastsenh/podcast.xml

Download the top episode, start playing it, then click on the small image in the top of the window (next to the progress bar) to open the larger display with the changing images.

Happens a lot.. don't worry about it.