I believe they are a bit underexposed, and you shooting in Center-weighted probably had something to do with it, I dont know... But cool location.
I love the 10.5 fisheye. The great thing about that lens is you learn to see everything VERY different. I would recommend just getting right up on things and shooting. ALot of people want to grab wide, expansive shots (which is cool), but don't get in your face shots of subjects, completely tweaking the norm.
For example, grab a wine glass and fill it half way with a red, place it on a long ledge of some sort (long bar, table, rail, etc..) then get just an inch or two away at an angle, open up the aperture, and take a shot...
Fun stuff.