Cover art/verification problem

Hello:

I am trying to get iTunes to verify my RSS feed that's posted at the bottom of this message through Podcastconnect.apple.com. I keep getting error messages. For some reason, my podcast cover art that I used in Soundcloud won't transfer to iTunes. Podcast connect won't let me post my cover art manually for some reason. Is this an issue of resizing or is there some error in my RSS feed? Thanks,

http://feeds.soundcloud.com/users/soundcloud:users:236415959/sounds.rss