The design is clean, I like the concept. I didn't see attribution for each photo, did I miss it? I wouldn't feel comfortable visiting the site everyday if you don't give credit to the photographer.
I just noticed the attribution is missing on the photo page, but present on the homepage. If you were only going to do one, it seems the one that would benefit the photographer them most is on the photo page - because likely that will be the one that is indexed and possibly found on your site later - thus the link would help them.
Also I believe that clicking on the photos has to take you to flickr.com, according to the TOS. At least that's what I remember. Clicking on the photo (from the detail view) seems to go to the same page.