I created podcast rss feed - http://topdj-test.com.ua/podcast/audio-files/12/3/ And I set up "<image>" and "<itunes:image>" tags. But when I put this feed to iTunes, the picture of podcast wasn't shown in iTunes in artwork section.
What have I done wrong?
iTunes doesn't use those images: only the iTunes Store.
The images shown by iTunes are taken from the newest podcast episode. If you want iTunes to display artwork, you need to embed it in the actual media files.