I love the featured image, and I think it's great to link to the user's page and the next week's vote. However, there have been a couple of times when I wanted to look at the photo in greater detail. I had to go to the meta and find the vote page for the week, then grab the flickr link from the answer. Wouldn't it make sense to have a link to flickr from the featured image on the main site? Or at least a "See other entries" (or something) link that links to the previous vote?
This wouldn't always be possible, as submitted entries are restricted to be exactly that size. Where I see an image is also hosted on Flickr, I tend to click through and invite all entries to be added to the Photo.StackExchange group. You may find that an easier way of navigating some of the various entries.
Of course, not everybody wants to use Flickr (I'd be surprised if the SmugMug folk did, for example).