I think you've done a good job on the site. The topic and content look good, the use of large images is effective and you're already getting some comments.
I think the navigation is fine the way it is. I can't really think of any way you could improve it greatly. I've never paid much attention to the average pageviews per session with my sites, so I don't know if 1.8 is considered low or not. Perhaps another member can comment on that.
One thing I would remove is the unnatural exact anchor texts that you have within your posts. It's not 2010 anymore so they are probably doing you more harm than good.